Big horsepower 318 builds

Other than pistons the part list would be similar is pistons at this level gonna change the cost all that much.

I would say if your looking to build 500 hp with any v8 by any make or size it's gonna be around 280-320 ish cfm heads, 235-245 ish cam with .500-.600 ish lift, 10-12.5 ish cr and 750-950 carb plus the appropriate intake and headers etc...