how to adjust vacuum advance

my first time timing, when i get my 34 or 38 since i do not have tape, do i point at 0 or mark, how will i know when i have my 34 or 38, be patient i can build you a house but new at timing and want to learn? thanks

Not sure about a 360 balancer, but a 340 only has a slit across it. The slit lined up with 0* on the timing tab would be TDC.

Anyway.....just set your light to 34*, loosen the dist , get a helper to rev engine to 3000rpm, then turn the dist until the slit on the balancer lines up with the 0* on the tab. Make sure the vac line is plugged at the dist so no vac timing is included at this point. At idle, shoot the timing marks. Bring the digital reading down on your timing light until the slit and 0* lines up. What did you get? That would be your initial timing.

Try that for now.