Help needed with sb 318

On my vapor lock when hot issue........another clue:

What is Carburetor Percolation? - Mikes Carburetor Parts

I note that when I took over stewardship, she had a huge 75 gallon fuel tank. The original. That had an electric fuel pump running to the mechanical fuel pump on the engine. I assumed it was to pull and move fuel from that huge tank. That was deleted when I replaced the large tank with a 20 gallon fuel cell. There is no return to the tank.

It also had (and still does have) insulation wrapped around fuel hose from pump to the carb. So looks like I'm not the first one to go down this road. Note the radiator is not at the engine. It is close to 8 to 10 feet away up on the deck, up away from all the hay chaff that floats in the air during operation. The engine has no fan running on it. It is in open air, but no fan offering any cooling help at all. Fan for remote radiator is run off hydraulic motor. It moves a huge volume of air, but none of that makes it to the engine. May check to see if it's possible to mount a fan on engine, even tho there is no radiator. And by default it does run in a hot environment. You make hay when the sun shines. The other day that meant doing on a day when temps peaked at 98*F.