Guess!

Did you zero deck the pistons? I am just trying to duplicate your SCR/DCR numbers with those pistons. It could just be in the head gasket....

That is pretty decent vacuum for that cam, so SOMEBODY knows how to set things up, LOL. (And being at 900 RPM doesn't hurt....) Any particular PCV valve being used, if I may ask?
The pistons are actually above the deck of the Mopar reject block, aka MP crate motor. Used a thicker gasket to get proper quench. Remember, it's a dish.
The PCV is what was in the valve cover when the customer dropped them off. We used a second breather on the dyno.