Assuming, of course, that you'll do a mass air conversion along with the cam/headswap, I'd say go with the venerable E303. It was designed to work with those GT40 heads and Cobra Intake by engineers far more qualified to make that decision than I, and I would stick with what is reliable and proven.
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-SamP, BSME-
~1998 Mustang GT~ - Saleen Body Kit, Cobra R wheels (17x10.5 w/ 315/35 in rear and 17x8 w/ 245/45 out front), 3.27 gears, FMS C Springs. . . Waiting for income tax check to do 99PI headswap!
RateMyStang
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