Mike G is giving some of the best advice I have seen in a long time. I bought a Newport conversion motor for my 41 Plymouth When I received it I read the directions and thought to myself "I have never bought any conversion unit that was an exact bolt in with no fileing or reshaping of anything" , so I preceded to remove the entire mounting bracket so that I could fit it up as needed to make it work. To make a long story short the Newport unit was exactly the same as the old vac unit I took off everything just fell right into place. This has to be one of the best suppliers out there. There units come standard as two speed but can be hooked up to an intermediate set up if you want.