Slant six idles rough

Shaun65dart said
Regular fuel. Just never seen bubbles like that in a filter

Depends on the RVP of the fuel, temperature, and pressure. Beginning in 1963 Chrysler mounted the filters so the outlet would let the vapor out, minimizing vapor lock.
Carburetion and Performance Diagnosis (Session 188) from the Master Technician's Service Conference

If the vapor pressure is high enough, it will force fuel in the rest of the fuel line past the needle and seat. Not generally a problem but can be occassionally.

Shaun65dart said
Closing the choke does not help it and makes it worse. In fact, when it’s idling rough, opening the choke helps it much more

That's a clue worth following.
A little rich is smooth, a lot rich is rough.
Do the plugs look fouled?