Put one in the wife's ranch wagon not too long ago. They do fit well, but the oil cooler fittings in the bottom tank are not at right angles to the tank. They are angled downward because the bottom tank is a different shape. This causes you to re-shape your tranny cooler lines. Not a really big deal, just be ready for it if you are running an automatic.
We also bought a matching billet Champion radiator cap. Looks really nice, but is a higher pressure cap than stock and caused our stock 56 heater control valve to leak under pressure.
Rono
Ron Lane, Meridian, ID