I like the Ford solenoid in the trunk idea too. It will make the heavy starter wire dead until cranking. You will then need to jump the small to big lead on your starter.

To be NHRA legal, you will need to cut the charging system with a switch at the back of the car. I have done this a couple times in the past by running the charge wire through the switch but you lose alot of charge voltage running the wire the length of the car twice. If I was to do that again. I'd use the switch to interuppt the field circuit.