I've heard that an AC Delco alternator for a Chevy Chevette is a direct replacement for the factory item on an MGB, and it will actually keep your battery charged, unlike the factory item.
Let me guess, original MGs used Lucas electrical components. Yes, Lucas, the Prince of Darkness, the inventor of the short circuit, the first to offer three-way headlight switches, dim, flicker, and off, and so on ad infinitum.
“AC Delco alternator for a Chevy Chevette”
Ha, are those even available?....I remember the Chevette......we called ‘em shitvettes. Lol!
That thing was a piece of crap.