New heads/intake/rear end

You can build a Spooled Dana for around 1200 with some frugal shopping.

For a little more than the 1500 you can also get a Strange or Moser Dana 60.

Call this guy, Cass, and ask if you can get one without the snubber provision. Might save a few bucks. http://members.aol.com/doctordiff/dana.html