"almost 220 degrees in the Texas heat in traffic". I'm not sure why you think you need to cool it off. 220°F isn't extreme, and it's not going to damage your engine. My BBF used to get that hot in stop and go traffic, but now I hit the fan override switch and let the fans run continuously in traffic. Rarely does it get much above 200°F.
Regardless, as it seems most comments have properly captured the essence that maximum temperature is a result of cooling capacity. Engine timing and tuning can play a role in getting temperature down but, other than that, you're looking at radiator, coolant flow and airflow.
Taking it from the top - do you have cooling issues when running hard? If not, then it's not a radiator capacity issue.
What kind of water pump are you running? Given the specs I'd guess a high flow pump, but that's not a sure thing.
How about pulleys? Are you running standard pulleys or under-driving your pump in a quest for lower pumping losses and more HP? If under-driven that will be a big problem when idling in traffic.
As others have pointed out, you may wish to look into a higher volume puller fan, or a pair of puller fans that provide greater radiator coverage.
What kind of
oil are you running - dino or
synthetic? My engine
oil runs ~10°F cooler with full
synthetic.
What weight
oil are you running? Running 10W50 or 20W50 when you don't need it takes more HP to pump as well as rotate - and HP generates heat.
Like others, I'd suggest a thermostat - mostly because it gets the engine up to temperature faster and reduces engine wear. It's unlikely to affect your stop and go temperatures. I'm running a 180°F high flow thermostat and would recommend that to many.
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