Well I guess I could also send you on a worthless quest to the Holley web site, but I know that all carbs built by them are not listed there
The R-3795 Holley is the C7OF-9510-C
1967 Comet,Cougar,Fairlane,Mustang 390GT std trans
The R-3795-1A is the C8OF-9510-C
1968 Comet,Cougar,Fairlane,Mustang 390GT std trans