To know for sure, you need to get a weight for your car. If the scales at the track aren't open, swing by a local truck stop sometime and get it weighed on their scales. I'd bet that a 95GT vert with you in it weighs in excess of 3600lbs. Using the info from your timeslip and the weight, you can go to the HP calculators on this site and get some estimates. Your MPH does look low to me. My 90GT ran 95MPH bone-stock.
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Jeff Chambers
T/S #3
11.97 Seconds/114.5 MPH
Chambers Racing Team