Estimates for 1/4 time?

Ten years ago my 82 Dodge D150 @ 3885 lbs. - Stock 360 Thermoquad /stock heads /cam /intake/8.6 Compression.
Torqueflite with 456 gears = Set NHRA National Record N/SA 2 12.12 @ 107 MPH.
This was a well prepared and put together stock truck! It had been as fast as 11.70 after that in class.

I do not know how I could of got it down to 3200 Lbs? It is a big vehicle.