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If its gonna be a track-only car why go EFI? Be much easier and cheaper to build and tune with a carb... I think you'll have a hard time getting an honest 400rwhp out of a 9.3:1 L98 shortblock naturally aspirated - especially at 5500 or less RPM's
if you wanna make good power at low RPM's you either need cubic inches of forced induction.
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