Causes of detonation?

Yeah, that's a good place to start......I read what you posted, then my mouth dropped open. Performer intake, AFB, aftermarket Voodoo cam & single exhaust? Whoa daddy......

Headers please.....2 1/2" duals please. BTW, those 302 heads probably bumped the compression over 9 or 9.5:1 at least, I'm thinking. Yeah, start with the exhaust.