It also depends on where you have your guage hooked up to, is it in the head or the manifold? If your sensor is in the head you could be getting a hotter reading due to being close to the exhaust manifold or header. My BBC runs around 180ish (sensor in the intake manifold), but it will reach 210 stuck in traffic and not moving. If all the parts seem ok (water pump, radiator is it a 4 core?) I would certainly get a thermostat that opens quicker, before I went to an electric water pump I ran a 160 thermostat