The serial number says (to me anyway) that it is a "Regular" 115HP engine (e.g. no heavy duty clutch, no power steering, et cetera), orginally outfitted with a stick (as opposed to a powerglide).
These were used in all Cars with manual trannies (except for the Corvette) and some of the lighter Trucks (eg 1/2 - 1 ton). If you had a truck, you could order the heavier duty stuff if you wanted.
IIRC, the G164 is a date code -- I think -- that suggests that the block was cast July 16, 1954.
So, to answer your question: My vote is thriftmaster.
