Mark,
Cleveland blocks have the timing chain cover cast as part of the block and use a flat steel plate as a cover. Windsor blocks use a 2" thick aluminum cover over the timing chain that the water pump mounts to. The thermostat housing on a Cleveland bolts to the block parallel to the deck on top of this cast in timing chain cover. This means that the intake manifold is 'dry' (no coolant running through it). On a Windsor, the thermostat housing bolts to the intake manifiold, and it's perpendicular to the deck surface of the block. This is a 'wet' intake manifold. There are other distinguishing features, but these will immediately smack you in the face!
Michael
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