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Engine has a slight hesitation to it when I throttle it quickly and has backfired a few times when doing this..



Not enough initial ignition timing. I would try curving the distributor to run 15* initial and 35 total w/o vacuum advance. Then after the motor is running well at that level hook up the vac advance. You may have to play with the vac advance adjustment a bit because it may give too much vac advance at first causing you to ping during cruise or light accel. Some combos will tolerate a lot of vac advance, others will not.