Okay guys!!
Have a new set up. Internal balanced scat 408 stroker. Same heads. Lunati 60405 (degreed correctly).
AFR is 12.5-13 at idle. Checked for vacuum leaks everywhere with nothing.
Still shaking. Especially when decelerating back down to an idle (1200 rpm) shakes a lot.
Locked my timing out at 34. Still shakes at idle. Haven't driven it locked out yet.
Only thing I'm looking into now is if the damper is wrong.
I'm going insane trying to figure this out haha.