19th Jan 2014, 16:46
If you want to convert to Olds power, I'd say go with a 350 or 403. They are the same block as a 260 and 307, and offer plenty more power and torque. A stock Olds 350 puts out around 170hp and 275 lbs torque. The 403 puts out around 180hp and 320 lbs torque. They will fit in without extensive modification.
16th Jan 2014, 02:24
Forget about the 307 and put in a fuel injected Corvette 350. If price is a concern, a TBI 350cid V8 will give you plenty of power boost cheap. Add a 345 or 373 rear end and you are good to go.