what to do
as far as power, after my headers, lid, cut-out (on-tuned) i put down 330rwhp
it took me a H/C package to hit 400rwhp.
that would be your best bet... that way you can get 400rwhp, with out running a real aggresive cam! just get a good set of ls1 stage 2 heads and a mild cam!
good luck.
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full exhaust + 230+ duration cam +good tune = AROUND 400 rwhp
full exhaust +baby cam +ported heads +tune = 400 rwhp easy
throw in an LS6 intake for more assurance, an ASP pulley for a little more insurance
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