You are correct Richard. The 66 is a non-sync 1st speed and yes it is the last trans that you would want behind the engine. I am the one responsible for the supercharged engine. Did the work myself. The trans is the last mod that really needs to be completed. I have been considering the 700r4 for the overdrive capabilty. I can not afford a richmond (6 speed) which would be awsome. What kind of tremec would bolt to the stock bell housing? Do they make an adapter plate?