it seems this is owned by Nick Alexander, but the Joe Mac license plate has me wondering

If you don't remember my post from a couple years ago  http://justacarguy.blogspot.com/2008/05/joe-macs-29-rpu-alive-and-well-again.html

Joe was the man, not one of many - the one, to go to for a Ford transmission for racing on salt or dry lakes. "He's one of my greatest heroes- a real car guy that has busted his knuckles on Fords for over 75 years, was one of the VERY first guys to go around to Ford dealerships and clean out their "Obsolete" stock for scrap rate and recycle it back to the car community starting in the '40s, he supplied all the local rodders and restorers for nearly 50 years" http://www.jalopyjournal.com/forum/showthread.php?t=152986
Back in the late 40s early 50s, Joe built the RPU from parts he had on hand with the purpose of racing and beating the more handsome cars of the time, with a beater flat out powered by racing Model A power.
Possibly this is the 29 RPU mentioned on the HAMB thread by the member JUSTPLAINBLL on 05-08-2008, 09:59 AM http://www.jalopyjournal.com/forum/showthread.php?t=261874&showall=1
Joe Mac once built a 29 RPU in his den from pieces he had scrounged. In case you didn't know Joe started what was probably the original Ford Parts Obsolete.After he retired to Corona you could call him for a rebuilt early V8 trans or rear end and pick it up next day.