Should I buy a 92 TBI 360

Yup. Snag it. Last of the LAs, roller cam, 308 heads, factory windage tray, takes standard LA intake manifolds (unlike Magnums). I wouldn't worry too much on the overheating unless it was on the verge of a meltdown- could be due to anything from a slipping fan belt to a clogged radiator to low coolant- not necessarily an engine issue. I love those engines.