302 mods

Ive got a 68 Torino GT hardtop with a 302 motor in living on 29k miles. Id like to punch out a few more horses then the rated 210 but im not sure as to what the best way may be. Ive found a few different intake manifolds that I like such as an Edelbrock and a Weiand but I dont know how much...

I'm going to be running a pre 1985 302 (in stock form) in some endurance road racing events. The engine will be in a 1984 rx7 shifting by a t5 keeping revs under 5k. We'll be running a small (ish) 4bbl, stock exhaust, or stock mustang shorty headers. Are there any 302 experts that could advise...