OK, an update to focus on where we're at.
Cam timing is right on, rechecked the transition in valve overlap at TDC.
Ignition timing is good, maybe slightly advanced.
No leaks or cracks anywere in the intake system found so far.
WHY SUCH A LOW VACUUM??? Vacuum is measured at the center tap on the manifold and 2 different gauges were used.
Apparently this condition happened simultaneous with the dropping of the intake valve but hasn't been affected by the valve repair.
