Percolation? Heat soak? Don't drive during summer??

Does it have a massive cam, headers, 1930's thermostat technology, and a fan clutch made by an aftermarket company with low quality standards?

Cars have come a long way in 50 years.
Well we could park my 410 dual-quad stroker in your garage and see if it gets hot but I'm going to have the AC on inside the car while we do it... on a hundred degree day I've never seen my car get over 205 no matter where it's at...