Probably not because the MPI uses a different style alternator. Something like an MGF might be the same fitmet though, I know the MPI used a k series style oil filter, so they might have used other parts from different Rovers?
Would you happen to know the part number of the stock MPi alternator? I wonder if there is a chart some where that cross references the fitment of the MPi parts? I don't want to use a stock one as I need more power.....100 amps or more. I'm also wondering if there is an alternator from a car that was marketed in the US that would fit. I know Saturn has an alternator that fits the standard A Series.