im about to get a 350 v8 for my 74' nova and im wondering if i should get a supercharger or twin turbo? what do u think? compared to hp-$$ ratio

 

Turbos generate power more efficiently. If you set up a turbo right, you can get it to spool at 1500 RPMS. The best way is to put the turbo flange at the point where the exhaust pulses merge. That is the point where you get exhaust velocity. With the turbo, you can have a larger one for the higher RPM range about 5" of tubing down stream for the most efficient boost.