You can't run LS7 heads on your stock block nor will an LS3 intake manifold work on LS7 heads. There are plenty of good threads here already. Do a little searching and reading. 
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521/480 (Honest Numbers) N/A LS2 403, WCCH L92 heads, Custom little BRE Justin Timberlake Cam, AR 1 7/8 Lt's w/ cats, Ti's, RAM DD clutch, RPM 3.90's |