These cars have the older 2.1 L engine. It's a good engine, except that the fuel injection sometimes goes south. A GT I think is turbo charged, which could be bad if they didn't change the oil on time. Any 1980 car with 245,000 miles is impossible to predict just what will go wrong. It's up to you to determine if it's running good. That said, an old Volvo is probably tops to withstand the years and mileage. I wouldn't buy it unless I looked it over real good and drove it first, I wouldn't just buy it on a lark from EBay. I would be wondering why it needed a head gasket. Did the timing belt break and toast the valves? If so, I probably wouldn't buy it. Again, it's up to you.