[Darryl Buckner]

Mines an 85 GT vacuum dist, and I mean plug off the vacuum port that way it won't advance. On the MSD dist, take the weights and springs out of the inside, or the newer ones have a pin you can lock the springs and weights to stop the advance. I can almost bet the problem is the converter you have says 2800rpm, but you can probably only stall it to about 1800 to 2000 before you push the tires. It probably works good on the gas because NOS likes a tight converter, and the converter will stall higher with the gas due to increased HP and torque. Mine is way too loose, I can stall it to about 2800 to 3000 before tire push, which is good for 60 foot, but sucks in high gear when the motor is making noise, but not going anywhere or blowing through the converter.