I did it with a 64 Dodge 440 with a 66 and up K frame (engine moved towards back from stock). I used a lot of the information in a thread here by 446acuda for pilot bearing, etc...
http://www.moparts.org/Tech/Archive/clutch/25.html
The scattershield is a Lakewood with tapped blocks for the Tremec bolt pattern. The bearing retainer is turned down slightly to fit the Lakewood. The center of the crossmember was cut out and replaced with structural tubing welded in to clear the transmission. There are a few flanges on the transmission that were ground off- nothing of any significance. The bolt-in transmission cross member is home-made. All clutch linkage is factory.