I agree with Don about aluminum heads. I would save your money for a set of Patriot heads which are some of the best priced of the aluminum heads out there. They don't flow like the high dollar heads (AFR, Profiler, etc), but for your application, you would notice a big improvement in performance and you would not be using 35 year old technology. You could easily have half the price in a rebuild of your double humps.

www.summitracing.com/parts/PAR-2169/