How much timing on a racing gen 3

Is your 426 a gen 3 or a gen 2?
Going to make 1st pass at 30 for reference, then try 28 and see what happens. Then 26.
Thinking about finding a chassis dyno in the area. Problem is most of them aren't familiar with Mopar, just late model Ford, Chevy and ricers.
Gen 3. 6.1 based 426.