Paul C, I think you're right about that primered 68 Hemi Barracuda in the other Sox & Martin shop photo being the ex-Don Carlton "Lil Thumper"...I also confirmed the decals located on the drivers side vent window with some other older pictures of it.
Notice the 68 Hemi Barracuda in the middle of the shop, that is the ex-Dave Wren B029 Hemi Barracuda, he must have had a couple of different paint jobs on it before he sold it.
So how many B029 1968 Hemi Barracuda's did Sox & Martin own back then, or buy off other racers and just resell them to other customers.