Slant 6 Vibration

Gettin good and hot and setting valve lash would be good idea first, then,

Are all of the plugs clean? No fouling? Does your mix screw need to be out alot of turns? Float level? Choke open all the way when warm ? Id rule out spark for now with all those new goodies.

Good call on pcv check. Ignition should be okay set at 3* btdc.

Vacuum guage reading might be good too, should be nice and steady. Check things like advance pod too and whatnot for vacuum leaks

My 71 valiant was about that bad, replacing the Chinese junk rotor an cap with good ole fashioned made in usa nos ones really helped. I also run electronic iggy. I still does it a little when warm and i tried a new metering block and popping a plug and cleaning the idle passages in it with nil difference. But i have an oily plug on 6 that stays somehwat clean and fires so i quit chasing it till i rebuild.