Shoot! I just leased an electric car, and I thought that's what you were talking about! I'm a huge electric fan!
I almost did this same conversion on my P1800. I've seen it done on the B18 motor, but I can't recall just what was done, since it was years and years ago (I sold my P1800 about ten years ago, sadly.
Good luck. (I just had to post here since nobody had in so many months!)