You might want to re-think this. Normally, the reason to stall the motor up is to get up on the cam. In a race motor, this is going to be 3000, 4000, 5000 rpm's, depending on the cam's characteristics.

From your description of events, it sounds like you may be using a stock or nearly stock cam because you describe the car pushing through the lights at 2000 rpm's against the brakes. The motor is probably up on the cam at that point, so trying to stall it higher for launch will only waste the torque at the bottom.

Also, if you research torque converters, you will find that the highest stall is achieved punching the loud pedal from an idle. It's called flash stall.

Try launching from an idle and see how the car works, then from 1000, then 1500. I think you'll find the sweet spot somewhere in the lower rpm's.

As far as a line lock, when we built the Luv/455 project for my son's high school ride, we cut the line to the rear brakes right as it passed the driver's seat. We installed a hydraulic gate valve in the line and drilled a hole in the floor, mounting the valve with the handle on the interior side of the sheet metal so that he could just dangle his arm down and switch the pressure off to the rear brakes. Then he could hold the front brakes with the brake pedal and wind up the slicks in the water. Rolling to the line, he reached down and turned the gate valve 1/4 turn and had rear brakes again for the trip down the 1320. This was a Chevy Luv pickup with a stock 455 Olds, stock cam and stock converter. He left from an idle and it worked great.