Was passed down my dad's 65 Coronet w/383 4-speed. Looking to make about 500 hp. What is the best way to go? Rebuild the current 383 (which is stamped HP) or rebuild a 440 I have out of a 68 Plymouth?Are Indy Racing heads the best route to go? And is it necessary to go with a stroker kit to get to 500 hp?New to the game, so I figured I'd ask the knowledge base here.
A 383 at 500 HP is 1.3 HP/CI, not an easy row to hoe. The 440 at 500 HP is 1.14 HP/CI, easier to do. For your 500 HP build the Indy heads are not required and the Edelbrock RPM or the 440 Source Stealth heads, properly prepared, will do fine. A stroker kit, though not required, would make a 500 HP goal very easy. More importantly, what is the budget you are working with?