340 Engine Shake

I am moving over to this forum from the 4 speed forum as I have determined that my issue is not transmission related.

I have a 70 Dart 340/4 speed. The motor was out last winter for the 4 speed install and while.it was out I installed Edelbrock aluminum heads and a lunati -10200703 cam.

I broke in the cam fine, but it has an intermittent shake at idle. It shakes so bad that shifter moves all over, but it will smooth out above 1100+ rpm. I first noticed it when I had it in jack stands to verify the clutch engagement and the driveline was rattling like crazy (intermittent).

I removed the driveline installed a slip yoke and the shake is still there.

340 .040 over
Edelbrock aluminum heads
Lunati cam (number above)
Air gap
Fitech EFI

I've verified timing, played with the idle tune, double checked firing order, swapped plug wires and nothing changes.

I'm at a road block as I don't know where to go from here. I need some help.