Timing by Vacuum Reading?

That works many times, sometimes you must retard it a bit to keep it from kicking on the starter, but that setting is ONLY good for initial/ idle timing. YOU MUST make sure the "curve" is ok and that you are not over-advancing at the higher end

two ways to determine that:

1....Have a degreed balancer or degree yours, or measure out what 35 or so degrees is by calculating "degrees per inch" on the measured circumference of the balancer, then mark it

2....Get a "dial up" or knob controlled delay timing light which can read out total timing from a dial. BE AWARE these can be problematic with an MSD ignition