Re: looking to buy a 1969 columbia 36 footer
That's fine about the engine.
A couple more things, I know you are asking about a Columbia, but you might want to go over the the "Boat purchase and review" forum. A LOT more people read that forum and you will get more response to your questions.
Regarding the classes I suggested, I can't answer for you since you don't list your location, but a lot of states require you take a boating safety class no matter how much experience you have.