I get worried on my old pump gas street muscle cars over 230 F with anti freeze and a 14 Lb. pressure cap.
I have seen 240 F on my S/P bracket car on the return road this summer, it does not have a radiator either so keep that in mind, it runs on E85 and has two very small oil coolers with a electric water pump to circulate the coolant for the cooling system, it was that way when I got it
You need to know that a lot of after market water temps gauges aren't real accurate, I use a infra red temp gun to verify all the ones I use now after finding out that one of my old high dollar Autometer mechanical race water temp gauge was off 40 F when warmed up
It would read 140 F and the coolant circulating in the radiator was actually under 100 F