I have two sets of heads they are
283 heads casting #3795896 60cc or
305 H.O heads #14022601 58cc

i was woundering what heads are better or would make more power? they are both getting bigger valves and ported but one set is goin on my camaro and one set is goin on my motor for my demolition derby car and i want to use the better ones on my camaro....