It seems a shame that no-one has answered after a week. I bought a '79 last year, and found it to be a very stout vessel, very thickly-built hull with no issues.
I'm no expert, but it seems to me, check the regular stuff and weigh repairs/replacements against purchase price.
In my case, I have learned that there is no such thing as a great deal on a sailboat. The purchase price is only the beginning. It has been said that a $30K boat is a $30K boat, no matter what you pay for it. Again, in my case, my boat needed very little done, but I have spent $thousands anyhow.
But don't let me discourage you. If the boat makes you smile, buy it.
Bashing about on Lake Ontario and Beyond
"Ariel" '79 Endeavour 32