210° @ Cruise and 180° @ Stop? What's Going On?

Thank you all for the responses. Lots of great suggestions here! I will be purchasing the hood to radiator seal this week. Other items I'll be checking are the spark plugs, timing, fuel mixture and possible collapsing of the lower radiator hose (currently no spring). If no fix after running through these items - will look into creating some additional ventilation around the shroud.(Cutting openings and using flaps)

More than enough to tinker with here and the good news is none of it seems to cost too much coin.

As always - thank you for the help. I'll let you know how things progress.