I have an 80 CJ-5 with 258 and 3 row radiator but it does not have a clutch driven fan. It has a 16 inch 7 blade fan with shroud. There is a 1" thick spacer between the fan and water pump. Clearance between the fan and radiator core is about 1 3/4 inches. The fan and shroud is the original factory HD cooling setup. With the 3 row radiator the temperature very seldom goes past half way on the factory temp gage even on a very hot day lugging down in soft beach sand.