[twobjshelbys]

It will be hot. The engine is inches from an uninsulated firewall and your feet will bake (even if you have the foot box air vents). I wore sandals all the time. Your feet will get really hot. The rest of you will be hot if you are not moving, but the open cockpit makes it pretty comfortable if you are moving. Think of it as a motorcycle

There is no practical cost effective way to add A/C after the car has been assembled.

Consider a Corvette.