I bought a C6 a couple of years ago to backup the 460 I am going to use for something or other. Jackson Racing built it, and they are still on Ebay all the time. Can't recommend them enough, good people with a good value. Here is one of several they are running right now on Ebay. You would have a hard time rebuilding one for this kind of money.

http://cgi.ebay.com/ebaymotors/FORD-...mZ260132501006


Don

BTW, does the 390 have the same bellhousing pattern as a 429-460? I'm not sure.