Hello. Welcome to SBO. I am to understand you sailed aboard a 46 and now you want your own boat.
Simple reply. You need to look at everything. Sails, engine, plumbing, condition of the decks, electrical systems, smells etc. it is a 43 year old boat. Unless you just won the lottery you will need money to fix what is broken. If the boat is cheap or free, likely a lot of money. Then you’re going to need a place to keep it. More money.
But the dream of sailing is a powerful aphrodisiac. So I suggest your hire a surveyor to help you determine if the boat is safe for what you want to do with the boat.
The surveyor will help to assure you the boat is living up to the primary purpose. Keep the water outside of the boat!
Good luck.