I'll have to say that most of what you want to do is a "one off" kind of mod. The '50's MoPars aren't exactly a hot seller in the rodding market even though they really are nice to work with.

Take a look at Speedway as they have some universal mounts that might work, but of course you have to do the final engineering/mods.

http://www.speedwaymotors.com/GmSear...load=1&start=0

or here....
http://www.tinmanfabrication.com/ind...d=44/prd44.htm

or here......
http://www.streetrodengineering.com/...tranmounts.htm