rebuilt motor?
 

I traded my old chevy for a 87 4runner the guy said that he rebuilt the motor and did other things some of things you can clearley see others not so much. This is my first 4x4 and first toyota so I was wondering if there is any way to see if the engine has been rebuilt with out it being taken apart. Thats the first thing the second would be the wobble in the steering wheel. It has new tires that havent been balnaced, so im sure that has something to do with it but the wobble gets worse when turning right and left. Any help would be great thanks.