So...found the source of the noise.
12E6ACA8-11DF-47AD-8B33-F881992C55D8.jpg
7822EFC4-F7AD-4188-B201-6D1CF9C61BA2.jpg
Crappy Fel Pro exhaust gasket didn't work too well. #4 was the worst and it makes sense as most noise was from that area.
New DMCH gaskets coming Wednesday. Bought from them as I needed a new bowden cable and a pretty DMC sticker to go on 3.0 cover.
Maybe Josh Bengston could answer this? Should I add more manifold studs, or is it fine with the 2 for each cylinder?