UPDATE
No blowby at the either valve cover breather hole at idle or 4500 rpm
Did a Leak Down Test for a benchmark and had 4-6% leakage at all cylinders except #4 which was 16% and leaking out carb only (intake valve related I assume, its always something
)
However, at idle and 4500 rpm both breathers had no vacuum and in fact were pushing air (exhaust) out of them effectively into the engine
Would appear that the check valve on both sides is not working.
Waiting on Moroso tech dept to provide their opinion on whether placement of the tubes into the header extensions rather than the header collector is an issue or not.