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Ok 1st off no the larger combustion chamber doesn't make any more power. The 906 heads have virtually the same flow characteristics as the 452's However the 452's have hardened seats in them, so if you're building them that will save you a few bucks. I didn't know this, and I had a set of 906's built, and I found out later I could've saved money . grrrrrrr.
Now granted I mud race, but is there any reason why you are wanting factory castings? I have to run them (stupid rules = OEM castings only), but it is actually cheaper to go to the Edelbrock Performer heads, than it is to have the factory castings built, ported, large valves etc etc..
just my .02
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