I say go for it. you might lose a small amount of low end torque, but you should pick up 5-10 horses up top.
75 mm throttle body is to big. stick with a 70 or 65mm. it wont hurt if the upper intake opening is bigger than the TB. And i would go with a pro-m bullet 75mm MAF meter.
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1993 GT/AOD
'93 Mustang GT