[Kenth]

Engines get hot from burning gasoline, there's no getting around it.
And heat is one of the three factors in converting the liquid fuel into a combustible gas. (the other two are velocity and amount of fuel).
The fact that the temperature of the engine rises slightly after the engine is turned off is nothing new.
The problem of fuel evaporation has always existed.
Luckily, the engineers who designed the Quadrajet didn't make the float housing any larger than necessary so that fuel loss could be kept as low as possible.
Then the fact that the oil pressure builds up during the time it takes for the fuel pump to fill the carburetor before the engine starts was certainly part of the design.
There are treatises written by smarter people on "The Principles of the Internal Combustion Engine" and "Car Engines and Motor Fuels" to read if you are really interested in the facts on the subject.

FWIW