FWIW the 512" low deck in my Valiant went 9.0's at 150 NA. SO you can certainly can make some steam this way. Will it live a long happy life, mine sure didn't. It went 100ish passes before the block gave out. Yes it had aluminum caps. Im pretty sure the 900ish HP from an NA combo in a stock block was just to much for the ole gal. I don't really know the power as it was never on the dyno but went 150 at 3470lbs so 900ish. When I did it they were between iron blocks and didn't have the $$$ for aluminum. I learned my lesson and now choose better blocks, but they have their limitations too I suppose.