Might be a dumb question, but are the fans rotating the right direction? If the wires are reversed maybe the motors are running backwards......just a thought. (I've seen it happen). I have muti blade Meriah fans, 5 core copper rad in the stock position, fans are still pusher and I also have a 3rd fan (sucker) on a toggle switch in case of heavy traffic (never had to turn it on), overdrive pulley, 180 thermostat, Hi flow water pump (but not excessive as too fast a flow sometimes pushes the coolant through too fast and doesn't give it a proper chance to cool), and no overheating problems. (although I did have an overheating problem when the engine was rebuilt as one head gasket was reversed blocking the coolant from flowing through the head, which is possible on a Cleveland). (Another time the top rad hose inner lining collapsed blocking all circulation and you couldn't even tell from the outside. Found it by accident when taking things apart.....)
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