haha. i have a buddy with a early 99 7.3 hes currently finishing up studs injectors, hpop, and an s366 turbo. im not sure on the boost numbers but the best bang for the buck with basically every thing else stock is the 38r. your biggest enemy isnt lifting the heads but more the PMR's you have.
and heres the aeromotive regulator
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04 F250 - 6.UHOH. Studded and Deleted By PSE, Fueled by Warren and Aeromotive, and Tuned by Gearhead.
04 Chebbie Tahoe LT - Stock w/ Nav and Bose
08 Tacoma Work Truck, V8 Power Nothing, A/C and Mud tires