I just purchased a 63 with the same problem. Vacuum advance as hooked to the manifold, carter has a port for it on the right bottom. I moved the vacuum line and the engine set down, idled great and correct rpm. No more diesel from the excess idle speed. Simplest fix for car the runs "rough" I ever had. Post a photo of you vacuum lines, it does matter, Rich
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64 GTO Race Car 462
69 GTO Judge RAIII 4spd 3:90
71 GTO 462 4spd 4:33
65 GTO Conv Resto-mod
1970 TA, Supercharged race car
1973 TA
1974 TA
1968 Lemans
New entry 1963 Lemans Conv
Yes I have lost it
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