15k is nuts for that power. I know you mentioned the weight savings but a $4000 block wouldnt be my first choice. Can make much more power, on pump gas and stay streetable. Heck check this thread out:
http://www.yellowbullet.com/forum/sh....php?t=1056498
I would keep the engine in the Nova with the cubes, talk to a good cylinder head guy like Curtis at RFD or Scott Foxwell. I cam tell from the picture unless its a old one those are factory iron heads on it correct?
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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