[blucar]

I would be very suspect of an engine that has doubtful parentage, with the claim that it has been 'overhauled', overhauled and rebuilt are two different things. Many people call an engine that has been repainted, overhauled, ie; overhauled with a rattle can.
If the price is cheap enough, in the two hundred or less rang it could be worth the investment, then have it torn down and closely inspected before you go through all of the trouble and expense to install it in your car.
The fact that the engine has been claimed to be a 59 239 CID, wherein it is a 221 CID,
gives an indication of possible other issues.