I have a 1976 Chevy C-10 with a Rocket 350. (Definitely did not do that.) Instead of rebuilding the motor, I purchased a 403 that will bolt right in to my 2004R. (Just rebuilt) My question is this: Will the headers be a direct bolt on from the 350 to the 403?

 

Yes. Both are small block Olds engines and have the same external dimensions.