Met this guy who lives two miles from me that does ceramic, powder, paint, weld, metal fab. etc. etc. His shop is behind his house with a complete set-up and no expense spared. Anyway, he sent these pics. of my manifolds.
The first pic is of the RH manifold down to metal. I found it in complete ignorance early in my education. I was convinced the RH manifold on my truck was a replacement, because the part number wasn't in sequence with the left
.........At any rate, GM did make a RH manifold that was in sequence (RH 45, LH 46). Same manifold as the more common 353030, only earlier production. Better shape than my 30, so worked out anyhow......Plus they match