Your second set of pictures with the B49, 848 and 850 numbers are foundry numbers for the sand castings needed to make that head. They don't mean anything to us now.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD