Well with that kind of an engine ($$$$) I'd be SURE to run antifreeze. Stranger things can happen and you leave the car at the side of the road and it freezes overnight. You are incapacitated and your help is out of town. You can probably imagine 30 different ways to have it happen.

In my long-term storage is a ford model B engine that froze in August. They had just gotten it back from the machine shop, put it back in the B pickup, were intending to start it (water in the radiator) when Ma called them in for supper. It got late and they didn't think to drain the block. That engine never ran, still has the brand-new oversize pistons in it.

"A word, to the wise, is sufficient."

R.