I think you should go 13's with the DR's.
I drove my brothers stock 99GT Auto to 14.2's@97.5 and I weighed 250 at the time. So I think with a manual and DR's, 13's should be right there.
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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