Sounds as though you still have the stock TB on the intake. Since the stocker is 60mm.
Your best bet would be to go with a 70mm if you plan on keeping it N/A, but if you plan on adding a s/c then get a 75mm. But when you increase the TB you will need to get a bigger MAF meter, a 75mm to 80mm would work well. I've never heard of a larger MAF giving computer problems unless its not calibrated properly for the injector sizes. If you do get a larger MAF, make sure its calibrated for the 19lbs injectors, unless you upgrade those aswell.
Good luck.
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1989 Mustang LX Notch
5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials
Best 1/4: 13.33@101.53MPH
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