MRL 360 Coolant Temp 210+

With driving creeps up past to 210 without any traffic. I am not sure what to expect since it is not a stock engine and with a 50 year radiator. I guess, my real question is this normal or do I need a better radiator for my application? If I do, just want something that works with current fan/clutch/shroud.

Or is this normal? I have not driven a vintage car of this type in 25 years - thanks.

Running NGK GR4 plugs