i am rebuilding my dads 1970 cutlass supreme convertible 350 rocket. i have the engine torn down and at a machine shop, im upgrading the cam, intake, carb, and headers, my question is what headers would fit my application, i have looked at some on summit racing, but unsure if they will fit, or what are the better ones. here is the ones i am looking at.https://www.summitracing.com/compare

 

Don't pay any attention to anything that states "except supreme". That is an old myth that for some reason just won't die.

 

ok will do, but is there a difference in headers, like will one fit better but lose performance?