the 1/4 miles time also depends on altitude, air pressure, and temperature

I know that with those modifications a GTP coupe would run low 13's (13.0-13.3) with a proper tune.
although that is with the 4T65E transmission. with the Getrag 5-speed it may be .25-.40 seconds slower.
and if you account for the weight of a fiero (about 700-900 pounds less) I would estimate the time to be in the 12.4-12.7 range depending on how well you shift and at what RPM's you shift at. if you went to a drag strip in a state with more humidity, it has the potential to take off as much as .20. but there are still the factors I mentioned.
if you want the best time, don't go down the strip at mid-day as the air pressure is at it's lowest. go in the mid-late afternoon.
also, the lower the altitude the thinker the air is. If you did a pass at sea level results should be pretty good. 1000 feet above sea level - slightly slower time, and so on.
because at higher qaltituded your engine is working harder to suck in the glorious oxygen.
try taking a brisk run at 5,000 feet above where you currently live, you will be out of breath in a shorter amount of time. this works the same for engines.
hope this helps.
and I hope you take a video

[This message has been edited by gtxbullet (edited 03-08-2012).]