Assume 5 miles per gallon or about $0.70 a mile in fuel costs. Add the cost of replacing the primordial sludge in the power steering and braking system, the differential and the transmission, then refitting most every rubber component in the drivetrain and braking system, then cross your fingers that the 30 year-old radiator doesn't turn into powder in the middle of nowhere.

Hope I'm not filling you with excessive enthusiasm.