[Rickysnickers]

I'm certainly no expert, but I see no mention of a carb spacer. I might suggest getting one of those phenolic carb spacers and install it, potentially eliminating the heating of the carb/fuel. Have you checked the fuel pressure? It's been mentioned many times that Edelbrocks don't like a lot of it, maybe 5-6 psi. The single line shouldn't matter much. That's how my truck was plumbed too.