coolant gauge says motor runs at 150f approx. this is after a 30 mile drive at 70f air temp. last week i drove 100 mile with air temps of 92f and gauge stayed at 200f. the temp sensor is at front location in edelbrock performer manifold. chevy small block. mild cam. there is a threaded connection on thermostat housing but i do not use it. i am not sure what temp thermostat is? been so long since it was installed. is sensor location ok? what thermostat temp should i have on mild small block build? 180f? higher?