Day two of the 64 Valiant

Sounds like fuel percolating.
Start by getting the carb off the intake with a small heat insulator spacer. Then I would do the slant 6 fuel mod with the fuel line. Basically, the fuel line comes from the fuel pump, up over the valve cover. The coolant through the Clifford intake, is a trick set-up. It actually warms the carb up when cold, and then keeps it at running temp once running. I have the same set-up.