Cam Degree

Another thing when i ran that head there was alot of rust build up in the hea

67Dart273 said

Not sure I agree with that but "OK"

Has it ALWAYS dieseled or did it develop?

Carbon fouling, other problems in cylinders even a damaged gasket "fire ring."
Timing retarded
Lean idle mixture
Too fast idle speed
Too hot spark plugs
Cooling problem, either system running hot, or something restricting flow causing block hot spots, IE rust/ sludge/ corrosion/ deposits/ etc

Something "odd" like an exhaust restriction can cause odd problems and is off the radar. Does it seem to have the "power" it should? I know slants are an "impressive powerhouse," so ??

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UPDATE
My car has not dieseled in the past three days. I changed two things at the same time so I don't really know which one fixed it. Guess the edelbrocks with electric choke have a open vacuum port with causes a small vacuum leak to help regulate the choke pull off mech by under hood temperature draw. Only problem it is directly over the exhaust port on a slant six sucking in hot air. I plugged it up idle speed dropped. Second my oil breather cap was gunked I forgot to swap it with the new one once I rebuilt the motor. Comparing both one was way heavier.