Mild 68 440, .509, etc

Just rebuilt the carb and gave it a super tune and it had a slight hesitation when stomping on it. New power valve, clean jets, accelerator pump, etc. I normally dont run a vacuum advance, its always run better without but I decided to try it again and see if that cured the hesitation.

It did, it revved smoothly and quickly but when I drove it, the timing was retarded enough so that it was noticeably down on power and pinging terribly when I put it on a load.


???