GarageDog,
It's for this reason that I keep all my old magazines. The Kit Car July '03 issue had some good info on just this sort of thing.
They were running a series on one guy that was building a Ferrari 250 GTO replica from the ground up using a tube frame and C5 running gear/driveline. I can scan the article if you need it, but the important thing is this:
http://driveline-service.com/
Drive Line Services
Concord, CA
925-682-3340
"Russ"
Hope this helps!
-jeff d
ps -- pics and an intro coming soon..promise!!