You should be able to make a very logical & educated decision.
Where else are you going to be able to purchase a factory original Blonde circa 1950s King Moretone- possibly nowhere right now. Blonde Kings are very rare, and get a premium price.
Top selling price would be approx $3500 from a reputable dealer. Figure 1/3-1/2 off that for a broken neck ( if repaired and functional) with obvious pegbox issues and a clearly broken button that indicates more damage, also likely a damaged internal neck block, new high quality bridge, and full setup + fingerboard dressing. Those big long length cracks on the top are a concern too. To "repair" all of those things would likely run approx. $2k+ in a reputable shop; possibly double in one of the spendy metropolitain areas. Now your $1700 bass starts looking like a $3700-5700 bass. If it was your grand paw paw's, no question get it done. For some random dork on Marketplace, then it should be closer to a $700 husk. The amount of 20th century US plywood basses awaiting a replacement necks compared to basses with good working necks seems to be about 10:1. I hit my shin on the big pile of them every day of the year when I walk past....
I'll give you $200 for the tuning machines, and that back would be useful to have as parts, but it will likely sit around for a couple of years.
This same base would be a potentially good candidate to have a new neck built to your specs and do a removable neck travel bass conversion, with a similar dollar amount in the end, but for different application.