1969 Race Dart w/ 426 Hemi- garaged for 45+ years

Yes, Stewart Warner. Very popular late sixties ( Judy Lilly and others) together with Bendix, maybe even more popular.
Later with Direct Connections, Chrysler may have had a deal with Carter... mostly Carter by this time.
Yes, electrical fuel pumps fed the mechanical fuel pump at this point in time... late sixties. Not a specific fuel regulator.