1973 4000 bass in need of a re-fret

Grabbed one off a friend who recently nabbed it from a co worker. Neck and radius are perfect and the thinness of the body is something I didn't know I needed 'til I played it. A lot more comfortable and solid than the bolt on Fender knock off I had prior. Couple questions though:
Would the neck be set or thru to the end of the body for this year? Not totally bothered if it's the former, just curious.
Fret board is original but it was converted to fretless way back
. Do the Stew Mac sizes listed here for a '78 apply to '73 as well? The luthier recommended to me has a large collection of NOS parts on hand but a specific fret wire seems like kind it may be kind of an outlier. Would like to keep it as original as possible...
Would the neck be set or thru to the end of the body for this year? Not totally bothered if it's the former, just curious.
Fret board is original but it was converted to fretless way back
