It's actually the rear brakes that need to hold better. If you can hold the rear, you won't have to worry so much about the fronts rolling or sliding.

Brakes have to be in tip-top shape. Adjustments, seals, bled, etc. I also lightly sand the rear drums after every race or two to eliminate any glazing. That increases holding ability.

I've heard that swapping the master cylinder lines may help direct more pressure to the rear, but not 100% sure on its effectiveness.

As quicktree said, a looser converter will help get the rpm's higher before it overcomes the brakes.