Though currently a one-of-akind show car, this XM-800 Mercury Monterey could be placed in volume production, according to Benson Ford. A four-passenger hardtop coupe, it is mounted on a 119-inch wheelbase and is only 55.6 inches high, lower than any U.S. hardtop in present production. Road clearance is seven inches. source: Popular Science. Est. 240 hp, 312 cu. in. overhead valve V8 engine, Ford-O-Matic three speed automatic transmission,…