My stock 1950 AD can and does sit in rush hour traffic on a weekly basis in 90+ degree heat and never exceeds 185 degrees. I don't have overheating problems with my 1956 Cadillac under the same conditions, either. It too, has a 4 blade fan.
Does your truck still have the original 216 with the high position pump? If so, that’s not exactly the same situation. The fan would be very centered to the radiator in that scenario.
I have a late 235 in my 51 truck with the short shaft pump and 4 blade fan. This places the fan lower than center and isn’t optimal. It works for me, but on a very hot day while idling and stopped, the temp will creep up a bit.
I’ve never been stopped long enough to have a full blown overheat situation. I don’t know if it would get there or find its max temp somewhere below that.
