IMO the dual quad setup is biasing here. It would be easier to tune the engine with a single holley than 2 edelbrocks. But he has the engine assembled and detailed and is reluctant to swap the manifold and carbs.

The engine definitely likes more advance at idle - but 30* total is a little conservative... how much HP could he gain having 34* without pinging? Car has iron manifolds but 3" exhaust.