Well forget American Collectors Insurance! After reading these posts I did some shopping. Heacock ended up being $260/year less for my two cars (1968 Shelby GT350 & 2009 Bullitt) with the same agreed value as I now have but with better coverage (zero deductible, $2K parts, roadside assistance, etc.)
Heacock is also a SAAC partner, so I guess it's time to switch.