It certainly looks like a 1929 U engine. The radiator shroud is from a 29 and the engine number U3948 would put it in approximately the first quarter production of 1929, that is if the engine numbers were sequential.
BTW... You can buy a new distributor base. There are a couple of threads about this part.
Chet...
BTW... You can buy a new distributor base. There are a couple of threads about this part.
Chet...