How can you tell if...........

You never know. it may actually be stock. Even with a smaller rear sway bar than later models my car handles like a champ (i don't push it that much, so i haven't tested the limits or anything) and all my friends ask if i've put aftermarket suspension on it. My car also sits kinda low it looks like, but the previous owners were too cheap to mod it so i know it's stock. GT mustangs handle pretty well for a stock vehicle so i can believe yours hasn't been modded.

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'84 Mustang 5.0 T5, FMS aluminum radiator & 180* thermostat, 1 5/8 shortys/2.5" duals, '88 GT tail lights and wheels, Holley 4160 4 BBL, smog pump idler, now with hi-po collapsed lifters in #3 or #4