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There's a specific site for Bullitts: imboc.com. Great guys w/loads of experience for the Bullitt. I loved my Bullitt.
The engine mods pretty much the same as the base 4.6l in those year GT's:
CAI, tune, Charge Motion Delete Plates & underdrive pulleys to start. It's already got the 3.73 rear end. Throw in some lowering springs, and poof, all done.