I don't really know alot about boats, but i'm in the middle of redoing a 67 larson. I will say it's alot of work and it better be a boat your really interested in. other wise you will probly lose interest after a while. I have done the math and it's going to cost between $1500 & $2000 (that don't include sweat equity) to finish this boat. that is about what these boats are selling for.
So I would look online and see what they are selling for and go from there. check the glassic library, you might be able to find out some info there.
I see alot of post here and on other tractor/car sites asking that very quiestion. here's my response. value is a relative term. if it is what you've always wanted or it has a lot of sentimental value then it's worth quite a bit, but if it's something your not interested in, don't like the looks of, or you just thinks it ok, then it isn't worth that much.. i will say this, if you are looking to rebuild and make a profit, it probly wont' happen. most of the time your lucky to break even. unless it's a rare collector. I'm rebuilding mine as a family project. I also wanted a boat that I could depend on for years to come. hope this helps. dt