Oh, one other thing...not sure if you (or anyone here) would know though.
I see that one or two of these cars was raced in Canada.
1) I assume that these cars were made in the States at either the (Lynch Road) Michigan or St. Louis plants, not in Canada? I assume this is the case as all the cars on your list so far at least, were.
2) Were these cars originally sold here in the States, and then just brought across the boarder to race?
3) Or if these cars were originally sold in Canada, were they "Canadian spec" in some way? Or were they the same as the other cars sold here in the States? I know by this point the US/Canadian Auto Pact was up and running, and that "regular" 1966 Belvederes were basically identical, no matter if sold here in the States or in Canada. So I assume the same would go for these, much more limited cars.