"B" body drivetrain into "A" body

here is what i've been using in my 63 dart with a 904/360 combo linked to a eddie 750.

http://www.bouchillonperformance.com/BPEtkdc.asp

It has worked great for the past 2 yrs. Takes a little effort and time to set it up properly but once it's set it stays. I do have to warn you that you may have to either dimple or add a small hump for clearance.