i would use the 192 t-stat and it will run a little better. i would also keep using 87 octane, but disconnect the sput connector and bump the timing up till u hear pinging, then turn it down a degree or two. u will probally end up bumping up the timing to around 14*. also, if you really want accurate readings, go with aftermarket gauges, those stockers suck balls. if want to stay w/ stock, change the 2 sending units at the very least. good luck.
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1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong!
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