Fast,
Sounds like great fun, I'm working on a '50 chevy 2 door deluxe and am putting a 235 in it (for now) I personally own a '54 engine with the 5913 head and another '54 engine with a 848 head, both of which are original head mated to original engine.
I have not been using engine casting numbers to determine the date of manufacture but rather the date code.
The one with 848 head came out of a truck, I do not know about the other engine.
Hope that helps, good luck
Ted
