It's Aw Shit Week at Glenn's Garage.
After a lot of messing about, I figured out that the chassis is 4" too long. I had thought that I had centered the wheels in the wells.
Turns out I was wrong about the front:
The Rears are near perfect:
The fix: Pull the cab and motor, shorten the frame another 4 " and re-do the front cab mounts and the tranny and motor mounts.
NOT a good day.