i am looking at a 1990 Ford F-250 extended cab lariat 4x4 7.5L v8 auto transmission. It has 100,xxx miles, lots of basic things have been replaced. The body isn't the prettiest but I'm not looking for a show truck. The rear tank has a leak and the gas gage doesn't work on the front tank. Needs a new exhaust from the cats and needs driver side window motor. It starts and runs good and they are asking 3,000$. Should I buy it?