:: Why would you do that on an old car? ::
I feel you brother but, if I ever get my mitts on a 1964 Impala coupe with a 327 (3-on-the-tree), I’d rather plop down the comprehensive.
If you do, I recommend going with Haggerty Insurance. If you don't plan on driving it much, and keep it garaged, the rates are quite low for comprehensive.