Its been along time since I've played with any old fords. I can't remember if the bell-housing bolt patterns are the same or not between a 351c and a 351w? If they are different can I swap bell-housings or do I have to use engine and trans? I've got a 73 mach with a blown 351cj, I want to put the engine out of my 69 Cougar 351w in it. Also, am i going to run into motor mount problems? Its been about 20 years since I've done any engine swaps on old fords, but it seem like I ran into some problems when I did it. I think I tried to put a 351c in place of a 351m and it didn't have the same bolt pattern for the trans. Any help to make this a smooth swap would be nice, I'm shure alot of guys on this site have done this swap or a reverse swap.