1999 Oldsmobile Aurora car smokes after different motor

I bought this car and when I bought the guy was less then honest. The front pully that works the water pump and so on was burned up pretty bada. Seller says thats the problem. So I have that replaced. Car still smokes like a fright train. So I thought blown head gasket. Had that fixed still smoking. Then I replaced the whole motor. It starts up. Go to drive it still smoking and now heat dosnt work and it's overheating really fast. The motor its self sounds really good. Any suggestings?
nikki