Well the panic has left me and now I can think straight.
Sat down with the dyno sheets and compared them to a motor I built for a buddy in 2013. Very similar other than his heads were ported RHS he bought used at Carlisle.
I think mine is 60-75 ft lbs short at 4000. And I really think it should make 585 or 590 HP around 6600.
So my plan is
1. Beg borrow or steal a flywheel and check cranking compression here in my garage. Have an extra starter and the original bellhousing. Flywheel we used on the dyno is now in my buddy's Dart.
2. Check all the timing events. I THINK I can do this with the damper and my indicator on the pushrod.
3. If all looks GOOD, I will open it up and retard the cam. Have a sneaky suspicion I might find the cam is not quite right. I mean even if Hughes advertised numbers are exaggerated by say......25CFM, it should still run better than it did. Just don't think the heads are the problem.
4. After the above 3 things, I have no idea where I'll go. To be honest with ya at this point I'm HOPING the cam is off. At least then I have a direction to go...