There were a lot of posts on this..
The only thing I would add is the investment of time.
I bought a 1977 for $9,500 and have dropped about another $6,000 in wiring, plumbing, electronics, and a new rudder.
Plus hundreds of hours in breaking down the interior, trucking everything home, sanding, sanding, more sanding, finsihing, finishing and more finishing. Hours cramped in the sail locker, on my back over the galley counter, in the head, hanging from my feet reaching underneath upside down with my eyes closed as I vision the nut/bolt/wire/hose...
And I mean HUNDREDS
For $3-4k with a plan and the knowledge you'll be spending at least another $14k, having the skills and patience to get 'er done...I don't know, might be exciting!!!!
Or....you can buy a 1981 for about the same price!!!!