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

j par said
I'm certainly not going to bite on the theory that the car is in the southwest and that's why it's not running good with said carburetor... Like he said it ran absolutely fine before, something has went wrong and I'm sure it's not the carburetor...
When it dies a couple tbsp of gas from little gas bottle.. (this will eliminate a fuel supply issue)..
Have the $6 ballast resistor ready and just plug it in after you try the gas and if it doesn't work you don't have to screw it to the wall just plug in the leads..
It ran just fine on ethanol gas before and now all of a sudden it doesn't for no reason? See why it just doesn't make sense?...

You're right, it doesn't make sense. It wasn't part of the original data that it was fine before (I misremembered the header/manifold situation).

I just know I struggled massively with heat issues when I was still in Vegas, so I relate to his situation. I tried literally everything (heat shielded gas lines, Re routes fuel lines, spacers, hear shield under the carb, and even a return fuel filter) and it still had massive problems until the weather turned each year (while my holley running buddy had zero issues all summer long... Drove me nuts!). I share that info to dispel the idea that a heat shield or spacer will help much, because neither did anything for me in the same situation. The thing that made the biggest difference for me was a new clutch and fan, but it wasn't a 100% fix either. The return filter helped some, but fuel would still boil in the lines/filter after shutting down and heat soaked. Hell, I could hardly be under the hood right away after shutting it down. Even in our air conditioned warehouse where I stored it every weekend. I also tweaked timing all over, jetting, rods, springs, fuel pressures, you name it. As soon as the highs dropped to the low 80s it was fine.

But there's more to @DentalDart's story than I remembered, and it points at electronics. The fuel squirt idea is a great suggestion in any case and will certainly rule in or out the notion of vapor lock. But since it was fine before, I doubt vapor lock is the root cause.