A833 Vibration Issue

The vibration is in the rotating assembly and not the driveline. I'm going to remove the belts next. The I guess I'm down to harmonic balancer, flywheel, clutch assembly, or engine itself. The engine was out of car when I bought it. The guy thought he was going to build a 360, but never got that far. It is a 29,000 mile 340 that is still factory built but I did head work, camshaft, etc. I feel like it's flywheel/clutch related. Just a real pissed to get it all done and now this! Everything is detailed, so gotta be careful taking stuff apart. Just stinks!View attachment 1715575313

Is that a cast crank 340? Do you know what year it is?