Quick timing ? though , I was told get best vac at idle in gear then back off 1" hg along with adjusting the idle mix screws at operating temp , with or without pcv plugged ? never done it this way I always used a light which I also have.
Adjust for highest vacuum and idle (with tune-up tach and vacuum gauge) and then back off a couple degrees is usually how you find the best initial/idle timing. Take it for a spin and test it. See how it starts.
Then you want to check your total timing at 2500-3000 RPM. SB like 34°-36° total timing at 2500-300 RPM.
Then you need to dial in the distributor curve to match the idle timing and total timing so that they are in at the proper time (pun intended)...
