I tried timing of 28* @ 90 to 100kpa. Lost alot of power up top @ 28*. Since I was intercooled and had meth/ h2o injection, I dialed the stock tables back and now run 34* @ 100 kpa with 12.8afr in WOT PE mode. I have had good success so far, but, I understand the concern for detonation. Now run a CamMotion 231/240* @ .550 lift/ 114lsa. Still running there today. App... 97 Camaro 383ci - D1-15 psi M6.