What is a "normal" engine temp?

[mclairmo]

My 396 was running fine the other day in about 80 degree outside temps. Gauge was reading about 190 as I cruised the streets. Gauge sender is in the head and gauge is a fairly new AutoGage by Autometer. Then, I get stuck in light stop and go traffic and the guage starts to climb to 210. Never goes above that, but it makes me nervous. I park it and it pukes a little bit of coolant out. I have a 20 pound rad cap with an open system, no catch/recovery can. I have a 4 row brass/copper radiator and Flex-A-Lite Black Magic fan with custom sheet metal shroud. New Procomp aluminim water pump. 180 degree T-Stat. Correct ratio pulleys. Radiator is sealed to the core support with foam. Running about 50/50 distilled water and coolant and also a bottle of Water Wetter. Bottom hose seems to be stiff, does no collapse easily, I believe there is a spring in it. Is this temp ok? At what temp should I get concerned?