i'd go with 1 5/8 with a full 2 1/2 exhaust, cold air intake (though from what i have seen it doesnt do a whole lot, not sure myself though) maybe ram air, rear gears also, it might sound off but with my 87 AOD, when i put the 3.73s in, i got better mileage in town, and almost the same highway as long as i wasnt speeding. that just comes down to how you drive the car. thats my thoughts at least 
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87 GT T-roof (needs paint) lol, rebuilt motor and trans, AOD - stage 2 shift kit, 3.73 gears - auburn posi, Dynomax Super Turbo Cat Back, FRPP 155lph fuel pump, K&N filter - air silencer removed, subframe connectors, strut tower brace.
88 GT T-roof
1989 LX Coupe 5.0 - 5spd
Rice Haters Club member#105
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