Still in the process of a carbureted 383 build. Got to the point of ordering some misc. parts. New thermostat and water outlet is one of those. Obviously there are some options for a SBC. Ranging from 160 degrees to 210 degrees. I know on modern, computer controlled, vehicles the ECU wants to see a certain coolant temp to enter closed loop. I know this also leans out the fuel mixture once the desired temp is reached. On a carbureted engine, does coolant temp have an effect on anything? The cooler the better?