car still diseling run on prob

Yeah, I don`t know how those guys get away with that, my Barracuda is 10.8-1 and with 93 octane and 38* total timing I get both detonation and dieseling. I`ve always had to run a mixture of Cam2 with my gas to keep from spark knocking. I could probably get away with less timing but the car likes it, so I have to go with what the car says. Lol!