Thinking of going BB...

StrokerScamp said

No. casting material has nothing to do with it. It's all about flow. Now, it's just coincidence that all the best flowing heads are alloy. That's because no one makes an out of the box iron for the big block. I suppose some of the offerings from MP would work......but still much port work is needed. I'm using the KB280.

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That's kind of what I was leaning towards. It generally seems that aluminum heads flow better out of the box when compared to the original casts. The main reason that would still push me towards 500 is that, since aluminum heads would probably used on the engine if I can get the funds(long term) then in the end the 500 would probably make more power.

Seems like the 451 is an amazing combination but would not benefit as much from the higher flow.