Boy am I getting lazy. I'd forgotten what a pain it was to run one of these older cars - charging the battery between rounds, changing the water every pass, etc. So I had already added an alternator (an alternator putting out 30 amps at 14 volts = 420 watts output; ONE HP =746 watts - small price to pay even at 50% mech. efficiency)
Now I'm adding a radiator so my bride won't have to drag me back form the end of the strip. Maybe with a pancake fan in there I can even Round-Robin it.