I've had both, 3.55's in a 90 GT and currently have 3.73 in my 93 Cobra and I definitly like the 3.73's better their really isn't that much difference at 65mph roughly 300 rpms. The 3.73's at the track help a ton leaving the line with slicks, if that is a goal of yours in the future, hope this helps.
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331 stroker, JE 8.5:1 pistons, H-beam rods, steel crank, main cap, msd with 3step, BBK ceramic long tubes,TKO, 4.30's, motorsport Z303, Victor Jr aluminum heads, crane gold 1.6, southside lift bars, 90/10 front, 50/50 rear, centerforce dual friction clutch, Vortech S-trim soon.
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