[whitedog76]

The width is the biggest factor. At 67" it's a little much. Looking at the subframe. I bet you could take out 1-2" per side. That would help a bunch.

You can get a 3.15 or 3.31 geared unit for about $500 at the salvage yard. The 3.55, 3.73, and 4.10 units bring a premium though.

Here's a complete setup.