so no need for the tape, not sure which side on the numbers to use though. My by ear timing and when it sounds the best is no where near the 16-18 initial. With the initial set to this range and having to adjust the idle to keep it running, my total comes in at 40 at 3k rpm. So guessing I'm close??
Some specs for your consideration: rebuilt 454 by professional shop, 30 over stock valves full roller comp thumper cam .227 intake at 50 547 gross (takin off the cam card what the hell it means??), RPM air gap, holley 750 dp, 3k stall t350