Day two of the 64 Valiant

I see the first culprit. Had the same problem. It’s the fuel line running from the carb to the fuel pump. Too close to the headers. Your fuel is boiling. Might try some insulation sleeve to get by until you figure out a better route to the fuel pump.
Any suggestions where I could run the line? I was going to bend a line up from the pump, along the outer edge of the valve cover to 90 degrees from the carb and go straight across the intake to the carb with a 90 degree bend to the fuel inlet. I did not set the car up but when I looked at it I figured the fan would provide cooling so I did not question the fuel line position.