Its probably an R-10 OD unit. The big ford motors used the R-11. R-7s were the late 40s, early 50s versions. Very good streeter trans. I dont have any of the OD parts, but if he needs 'soft' parts for the gearbox; I've got some left, just PM me.
Thats actually the better of the OD designs, over the Gear Vendors 'Laycock' design