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What does suck is the piston faces of almost all the cylinders look wet and black. Curious to see what the leakdown says.
Make sure your intake manifold is not sucking oil into the bottom of the runners
This is not a uncommon problem with built (heads and block cut)B & R/B type motors with the stock valley pans
Are you using a single plane intake or dual plane like stock? If a single plain pull the carb. and look down the intake runners towards the heads, it the intake is dry and dull looking and the intake ports in the heads are shiny and wet then you have located a problem to fix that will make your motor run a lot better
