Timing recommendations for 12.2:1 E85 408

I would start at 30 and make a run. advance it 2 degrees and make a run and continue until you lose mph, then back it up 2 degrees. Wait so you are happy at 36? I would start at 34 if you pick up mph at 34 go to 32. If you lose mph go to 38 if you lose mph at 38, then you know 36 it is. Then you can try 1 degree changes, but you really need a couple of runs at each to see any real change. At 1 degree there are just to many variables that can throw you off. Most dampeners are not that accurate so trusting the exact number can be troublesome.