Kimberly,
Sounds like you have done this before, or have seen it done. So, to help the ignorant, what kind of pulley does it require, or would the one from the MG fit? I just put a rebuilt Lucas alternator on my '77 and it's doing fine. Possibly down the road this might be a consideration. Certainly a lot easier than some of the other Lucas to Delco conversions I've seen.
zach
Happiness is an MGB!