That smoke seems to be too much fuel when accelerating. A faulty accelerator pump is usually really bed hesitation.
Check the vacuum hoses.
With the head rebuilt, it's possible that the carb needs to be adjusted. There is a really easy way of doing it correctly the first time.
The general problem is that the throttle position sets the idle system and it's difficult to uncouple the two.
Get yourself a small propane torch and cut the torch part off. Attach an on/off ball valve and then to vacuum hose size.
You want the engine at operating temperature if possible. The choke needs to be fully open and not in fast idle.
Attach the propane to manifold vacuum. Turn off both propane valves. Attach a tach. Start the engine.
On/off valve on. Add propane so you reach max RPM. Too much will decrease RPM,
Basically what you want is the ability to be able to turn on and off the propane and get very little change in the RPM (i.e 25 RRM) at the idle speed. You will be adjusting the mixture and idle speed screws to attain this.
Once you have that, the throttle plates are positioned in the idle system.
A primer:
When the engine is cold. A push on the accelerator will close the choke and set the fast idle cam.
if the engine is warm, the fast idle cam doesn't get set.
As the engine warms the heater on the carb and/or a linkage to the manifold temperature slowly starts to move the fast idle cam.
When when car starts, the "choke unloader" is pulled off by a vacuum linkage. This opens the choke plate a small amount. That could cause more fuel if the unloader is not functioning. Usually it's a diaphram attached to full engine vacuum that yanks on the choke plate/
Some cars added heated air to the air cleaner controlled by a vacuum door.
All of the mechanical stuff has to set first. fast idle cam. choke unloader. As the car warms up, the fast idle cam moves.
Finally, wide open throttle opens the choke plate independent of everything. That's your flooding fix.
So, the hardest part is getting the throttle plate positioned so the carb is in the idle system. if you enrich the mixture there should be no change in idle speed except for the fact that you can add too much propane and drop the RPM.
You start with the suggested initial mixture settings. Full seat and back off x.y turns. (e.g. 1.5 turns)
EVERYTHING HAS TO WORK TOGETHER.
Check the vacuum hoses.
With the head rebuilt, it's possible that the carb needs to be adjusted. There is a really easy way of doing it correctly the first time.
The general problem is that the throttle position sets the idle system and it's difficult to uncouple the two.
Get yourself a small propane torch and cut the torch part off. Attach an on/off ball valve and then to vacuum hose size.
You want the engine at operating temperature if possible. The choke needs to be fully open and not in fast idle.
Attach the propane to manifold vacuum. Turn off both propane valves. Attach a tach. Start the engine.
On/off valve on. Add propane so you reach max RPM. Too much will decrease RPM,
Basically what you want is the ability to be able to turn on and off the propane and get very little change in the RPM (i.e 25 RRM) at the idle speed. You will be adjusting the mixture and idle speed screws to attain this.
Once you have that, the throttle plates are positioned in the idle system.
A primer:
When the engine is cold. A push on the accelerator will close the choke and set the fast idle cam.
if the engine is warm, the fast idle cam doesn't get set.
As the engine warms the heater on the carb and/or a linkage to the manifold temperature slowly starts to move the fast idle cam.
When when car starts, the "choke unloader" is pulled off by a vacuum linkage. This opens the choke plate a small amount. That could cause more fuel if the unloader is not functioning. Usually it's a diaphram attached to full engine vacuum that yanks on the choke plate/
Some cars added heated air to the air cleaner controlled by a vacuum door.
All of the mechanical stuff has to set first. fast idle cam. choke unloader. As the car warms up, the fast idle cam moves.
Finally, wide open throttle opens the choke plate independent of everything. That's your flooding fix.
So, the hardest part is getting the throttle plate positioned so the carb is in the idle system. if you enrich the mixture there should be no change in idle speed except for the fact that you can add too much propane and drop the RPM.
You start with the suggested initial mixture settings. Full seat and back off x.y turns. (e.g. 1.5 turns)
EVERYTHING HAS TO WORK TOGETHER.