The higher temps help evaporate the fuel "atomize ".That is why they use chokes.So enough fuel will be in a burnable state to get ignition . As the temp comes up ,more fuel is evaporated quicker and the choke is needed less. The Warmer the air the more fuel it will entertain but that air charge is less dense.The air charge will have less Oxygen available in that charge to support combustion. If your engine never sees 180°. You'll wash down the cylinder walls ,dillute your
oil. When I was searching for a high flow thermostat for my FE ,I was told to stay above 180° . The higher the temp the more power you'll make ,up to a point of deminishing returns.Too much heat and it is hard on engine parts like pistons ,rings and valves.They will only take so much.My thing was keeping temps stable.When temps get too high the coolant boils next to the parts being cooled .Heat removal is deminished. and temperatures start to get out of hand. Cobra replicas don't have the usual cooling systems and make a bunch of heat.It usually works fine ,but when something out of the norm happens temps esculates like mad.Like coming off the highway to stop and go traffic on a hot day, you' behind the curve alllready.How much will your prescious engine take? Also the higher the pressure the higher the boliing point but how much will your system take like coolant pump seals , radiator and hoses and gaskets?It is a dellicate ballance at best.You make your choiches and takes your chances and then pay the price.That temp gauge is there for a reason watch it and take action when it is indicated.