Internal balanced..what damper do I need

Sorry I've been away for a bit. I've tried everything with the timing and dosent change anything. So right now I'm locked out at 34. Like I said the engine smoothens out about 1300 rpm and is dead still. AFR is 12.5-13 at idle. Entire ignition is new. Starts instantly. No miss when revved. So I'm confident the ignition is good. The flexplate is brand new and is for a internal balanced engine. And the torqe convert or is a tci super street fighter.

This may sound stupid but the shake is at the top if the engine. When I look down at te mounts there's no movement at all.
Another weird thing the shake gets worse the longer I've been driving the car. (Only at idle or slowing Down below 1300 rpm) I can feel it. Is like a chopping.
I hAvent driven the at since I locked the timing out. Before it was 21 initial. 32 total. It's almost like a lean shake issue but my AFR reads around 12.6 when this is happening.
I know I'm rambling and repeating myself but I'm just trying to give as much Info as I can. I've also checked everywhere for vacum leaks.

Even tho I don't think it's gonna fix I'm gonna try new engine mounts. Anyone know of a good brand or where to get good ones.

As far as the damper it is solid on the front smooth. And a groove/knotch I can feel on the backside. All the way around. I can't see any part numbers yet on it.
360 to a 408 scat stroker that's internally balanced from scat. My machine shop did all the work.even assembly.

I'll try and take a video.