Engine: 250
Carb: Rochester B
Problem: After installing long tube headers and rebuilding the carb, my truck will only idle normal with the choke barely open, maybe 1 mm open. If I open the choke the idle keeps climbing until I shut it off or it stalls out. This is with engine cold or warm.
I have sprayed carb cleaner everywhere as I assumed there was a vacuum leak somewhere, but no idle increase.
I also set the mixture screw 1.5 turns from fully seated.
More info:. There is an exhaust leak where the pins are. I purchased new studs to replace those pins, though.
Honestly, I know nothing about carburetors. I'm 35 and this 64 is my first carburated vehicle.
Any help is appreciated.