Not a lot of people go with headers on Pontiac engines for this very reason. Bad fit and big leaks, and not much more performance than the ram air manifolds give. They usually upgrade to the factory ram air manifolds which are reproduced now. They even make them with larger port flange sizes. That’s what I have in the Gramma car.
The front mounted 455HO metal tube is really just to prevent chafing on the front of the block so it’s really not that necessary on a modified car. The harness can be protected in other ways. The solenoid heat shield is reproduced in the aftermarket. I can post some photos later when I get home.
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