a question on heads

i'm currently starting the project of building a new pulling engine for my 1974 hi-boy. i'm starting with a dove block, a steel 460 crank offset ground .030" also bored .040" which brings me out to 472 cid ok now my class limits me to cast iron heads (supposed to be a stock item but i'm willing to chance that rule) and they will try to stick a magnet to them. so with that in mind i'd like to find the best possible head for my application this is the first "big block" i've dealt with my old engine was a fe which was made into a boat anchor on the last pull any info will be greatly appreciated and thank u for your time