as long as the engine dosn't rise to 225* it will be fine.. ideally you should have a 180* thermostat, the motor should get to 215-225* but no hotter at idle, and around 180-195* cruising...

BTW, I think you need a new builder. the valve timing set to -3* on a street engine is no good.. only run str8 up on a street engine. that will probably cause you problems.