65 Dart Wagon Conversion to a Sedan Delivery

What ambient air temperature will you be driving in? Best bet is to use a thermostat bypass as someone else said, if you have extremes in hot and cold weather.
This will be basically a late spring, summer and early fall car with spring and fall average temps in the 60’s/70’s. Summers can be pretty brutal temp and humidity-wise. I like the idea of a thermostat bypass and will incorporate one.