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You guys are seriously over thinking this. Both oil and coolant can be used to shed thermal energy from the block. The obsession with big oil cooler because up until recently it was much easier to hook up some large oil coolers instead of a custom radiator.
That said, coolant is a more efficient medium for heat transfer (lower viscosity, faster heat transfer) than engine oil. One should consider upgrading the radiator first before touching the oil coolant. Plus, a more efficient coolant system will lower the load in the fragile water pump that we on this engine.
Turning on the heater will help, but only marginally. The air flow from the air con fan is no match for the air flow that the front radiator sees. Plus your heater core is tiny comparing to the radiator, which is already undersized for a modded N54.
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