A stock 87-93 5.0 Mustang runs mid-14's and your GN probably ran high 13's, maybe a bit quicker.
To get 13's from a stock 5.0 I suggest 3.73 rear gears, a PRO 5.0 shifter, Edelbrock or TW heads and intake, headers and an H-pipe plus a 190 lph FP, adjustable fuel regulator and a hotter coil along with other minor parts. $2,500. is more than enough to do it right. With decent rubber you can see low-mid 13's easily. Have fun.
