Built 360 Having a Tantrum

Dodge72 said
And here's the picture for the exhaust gasket on the driver's side:

View attachment 1715341960

That's not a header gasket. You either have pretty low compression ratio or a huge cam and I doubt the cam is very big.

While you are that far into it, you might as well check the cam timing. It may be retarded so far it's killing cranking compression.

I'd have left the SD on it and fixed the other issues.