I know HR's were '64 out of DST and OTC for several years afterwards. I refer to the mustangtek site, which claims the BV as "65-67 427 Hi riser Race". The Cobra applications are shown as unverified. Why would they say Hi Rise if they are talking about a carb? Obviously, the '66-'67's are MR's, but they don't say that. A person such as myself might think that BV's were "also" used on a single quad HR, which, as I mentioned, might only have been available OTC, maybe in a package with an intake.
Why am I trying to clarify this? I have a cherry BV sitting on an equally cherry C4-G intake. The carb has a 603 date. I do not see a date on the intake. I'm trying to figure out if the carb and intake were born together, that's all. If there was a chance that there was a carb/intake combo OTC for the HR, or if there was a complete High Riser 4V DP crate engine available (I'll bet there was), then I would consider my parts to be possibly mated from the factory.