Racing means, you need all your ponies driving the rear wheels.  There's plenty of time for charging your battery later.

Refer to prior post:

http://www.y-blocksforever.com/forums/FindPost26651.aspx

I assume you have a Ford alternator (not a GM 1-wire).  The diagram is typical of most Ford alternators, but came from a '90 Mustang.  See the "sense" wire that goes to the Battery Indicator (GEN light) LG/R #904?  If you cut that wire and install a switch, the alternator will sense that your key is off, and it will not produce power.  More importantly, it won't draw horsepower from the belt.

You don't need any fancy kits, but I would put a big red flashing LED next to the switch anytime it is off (it should bother you).

Hope this helps, and I hope it gives you and your daughter the edge to win races.  Modern cars use a Wide-Open-Throttle Sensor that shuts off A/C, etc., and delivers all your hp to the wheels, to get you off the railroad tracks.

  - Dave

Harry. Good to hear that you’re getting that beast ready to rock and roll. Putting a toggle switch into the wire going to the field circuit of an externally regulated system will accomplish what you want to do. What Dave suggests with the later model Ford internally regulated systems is the alternative. My ’67 Comet with a 427 Tunnel Port had a limit switch hooked up to the accelerator that would allow a disconnect of the field circuit whenever the trottle went to the wide open position as being wired this way, I never had to remember to turn it back on.

We will be trying all the tricks I've learned over these many years..

Again We thank y'all... It is very good info... Ted how come we haven't seen the 67 Comet.. ?? Been looking for ya at Cedar Creek and the new strip at Crandal..