In case anyone was ever curious what a 465 might run temp-wise, I saw just over 210* on the gauge while pulling multiple decent grades for long periods. Ambient temp mid 70's, second gear, 25-35MPH. No trailer, maybe 500lbs of extra gear.
Cruising for 2 hours on relatively flat ground, speeds from 35-55, temp never went much over 100*. Noticed on the way back that once temperature climbed up to about 150* from some moderate hills, it did not drop back down even though I was travelling the same surface street route at the same speeds.
Temperature climbs pretty slowly even under the heavier load of the hills and second.
Nothing real explosive from this information, everything I saw for temps is pretty much what I expected, but at least I know my temp setup works.