I'm not an expert, but my feeling is that for a stock or near-stock engine setup the OEM sized radiators should do the job. GM tested them in all climatic conditions such as Arizona summers with the A/C on.
Now as one moves away from a stock configuration, i.e. one that creates more waste heat, a cooling system that can move the heat out to the air may be necessary.
Compound that with engine blocks with scale buildup inside, which reduces heat transfer in the block, A radiator that can further reduce the temp of coolant circulating back to the block from the radiator, may be the ticket.
George
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