First of all sorry for my bad english, but I`m german.

I`ve tuned  an Olds 403 ( yes it`s not a common choice  with the following parts: Olds 5a heads with stock valves and roller rockers, Edelbrock RPM Intake and cam, 750 Edelbrock Carb, 2 1/2"dual exhaust, MSD Digital 6 plus Ignition. The stock ignition setting is static 20 degrees BCD, but now with the higher compression and the other parts I think it will be different. Wich is the best way to find it out and is it nearly to 23 or 17 degrees.

Thanks

Oliver    

You might want to check with the olds fanatics at www.realoldspower.com

I would drop a degree for every full point of compression you increase, depending on the cam specs.