Experiment with connecting your vac advance to ported or manifold vacuum and see which works best. Make sure your vac advance can is still good.

Some misguided mechanics, who are used to hacking on SBCs, will disconnect the vac advance and run the motor on full mechanical with lots of initial lead-in. Usually makes anything but a 327 race motor run like crap. Like your motor is runnin' 6 grand through the 1320 anyway. Recurve that distributor & check all vacuum lines, and it'll run better.

good luck

chip

OH, make sure the vacuum modulator from the TH350 is run to manifold vacuum.

Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes