I recall the '93 LX Notchback (read Trunk) running around the 14.5 mark. Lightweight and very stiff body. GTs packed extra weight with the same power so... who knows. Stock for stock though, you should have him from a dead stop.
PS. AND I'm not ashamed to admit, that the '93 5.0 Notchback is one of my favorites rides of all time. FORD Baby! Of course, screw the poor gas mileage and zero traction in the rain or snow. The 2005 stangs look sweet however.