I have a 71 mach 1 w/351c,.30 over ,Comp cam 268/268 W 494 lift, Weiand intake and 700 holly. Need to know the base for the timing.

 

Which Weiand intake, and which heads and what's the compression? It's gonna depend on the engine, and modified stuff has no standards, you just gotta mess with it till it runs right. If you have the right intake and compression, then prolly like 14 give or take. It's also gonna depend on fuel availability.