It's about right. I was running 15.2's with gears only on a 5 spd, so that is right around where you should be. I saw your other thread about adding the intake/exhaust/stall, slap those on and it should really wake up your stang. Good luck
Tint is not a mod. Keep going to the track and in time you will run faster. My car bone stock back in 1994 ran 16's the first time out. With no other modifications and me going to the track each week I got it down to a 14.4.