Yes the fuel does boil out of the carbs and down the intake. After some driving on a warmed up motor if you stop at a store for 20 - 30 minutes and come out to start the truck you have to give it extra throttle to keep it idling. It wont even idle on its own. You can smell the raw fuel out the exhaust. You have to keep the RPMs above 1500 for 20 to 30 seconds before it clears its throat and will idle on its own. On a 5 minute stop this wont happen. That's why I thought dropping the float level just a hair might help. I had an old MGA that did the same thing every summer.
I have insulator blocks under both carbs and have built a heat shield from 2 layers of aluminum with 1/2" spacing between them. Even put fiberglass insulation in the air gap. I hope this info helps you guys.
Thanks Sharon