Maybe some bad news.
If it is a 12 volt AC transformer you should have 16.8 volts AC out . (1.41 X 12) and that should be at load.
If it is rated at 1 amp and you want 1 amp out at 12 volts it may get a bit to hot. With a full wave bridge you need to de-rate it.
http://www.hammondmfg.com/pdf/5c007.pdf
Your kind of on the edge trying to get 12 volts out. With 3300 Ufd. the ripple will go as low as maybe 13.4 volts because of the diode drops and the voltage needed by the 317 to regulate. You can help this with better diodes and/or more capacitance.
So if you are looking for 12 volts at about a half amp you are probably ok if you can recheck the transformer voltage.
Whatca think?