I think that you will need a bit more explanation, even if it just for a simulation.
What do you mean by 42% gain? If you want the output voltage to be 42% more than the input voltage, you need a boost converter, which is much simpler than a buck / boost converter. If you want the output voltage to be 42% of the input voltage, you need a buck converter, which is also much simpler than the buck/boost converter.
Have you got ranges for the input and output voltages?