Jonathan
Here's hoping you do someday find one; a completely "new" and un-built kit would no doubt be better than the one I've been dealing with here.
This Varney example is still showing signs of an occasional bind: I had it on the test track today, and although it runs okay for a while, it'll suddenly seize up and the "overload" light on my Heathkit power supply will come on. It looks to be the center (geared) driver on the left (fireman's) side; a little gentle rocking will free it up again, but this happens repeatedly, so I guess I'm not out of the woods yet!
I enjoy the whole trouble-shooting process (and discussing it here) but this engine is really putting me to the test...
Mark in Oregon