GTech vs Track?????

[Stang Runner]

I know going to the track is better but how good is the Gtech at the 1/4 How close is the Time@MPH to the track? any one used the Gtech at the Track? I just ran a
0-60MPH 6.29
1/4 14.90@100.2MPH
The very Bad time is my gears and my Trans and the New Stock Cluch That slips bad got a bit of spin in 1st and more in 2nd I finished in 3 at about 5000rpms

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1988 LX 5.0 3060lbs (full Tank)
Drivetrain: 2.73 Stock Gears, World Class T-5, Lakewood Bellhousing, Summit Adjustable Cluch Quadrant & Cable, Alumminum Driveshaft, Flaming River Manual Steering Rack
Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks
Engine: Steal Mounts, Ram air, K&N, Under Drive Pulles
Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\back