If you build the engine and want to keep matching numbers, I would use forged pistons and balance engine. Roller will add HP also as option. If you have 1.66 exhaust you can up to 1.77 size. Install screw in studs. Careful build and cam with good exhaust, yes RA manifolds will give decent power. If numbers don't matter, the 96cc ish heads work well. I used #96 heads in my last 455 build. They are big valve, screw in, and have exhaust holes for all exhausts. Premium gas. Crossover muffler is a bad choke. But you can get a better one than stock if want to keep.
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72 Bird
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