Timing recommendations for 12.2:1 E85 408

My old 410 combo (almost identical to yours except ported Edelbrocks and less compression and a 750dp) liked 34° the best. That engine ran 10.8's most of the time during the summer.

My current 408 on e85 likes 34° (13:1, ported Edelbrocks, Victor, solid cam with 264/268 duration @0.05, XP 950 e85 carb)....granted, I have not tried giving it more yet. New motor runs 10.4's in the heat (hitting my rev limiter)...hoping for 10.1's in the fall once I replace the rev limiter chip.