Not sure what you're asking, exhaust to head bolts of exhaust pipe to header? Clamps? You should use a 235 manifold vs. the 38 for sure, but you could make the 216 work with 235 but not the best set up.
Best of luck
Jim


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed