After more research I've decided to go with a LS2 4" bore block. A L33 block can't be bored as much as an iron 5.3 block can, so that's not going to work. 4" bore with 4.8 crank will make 329 CI and the larger bore will unshroud the valves. I'm pretty sure I'm gunna use LS3 heads since they have lighter valves and should flow enough for a high revving 329 CI without port work. Now I've just gotta figure out how to steal the LS2 from my sisters TBSS without her knowing.
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