How do I stop vapor lock?

I tried WOT again, but not with the open gas cap. It sputtered a little, but I hadn't been driving it 100 miles either. It is apparently the vapor in the lines building up in heat, no doubt.

The thing that concerns me about opening the vent in the filler tube near the top of the neck is when filling the tank. The pumps sometimes do not shut off and the gas comes spilling out the lip of the filler tube. I didn't check to see if the vent tube is higher than the lip or not. Does anyone know if gas comes out that vent hole when filling if the pump doesn't shut off? I don't want gas in my trunk...

I plan on getting the vented filter and hooking it up to the vent tube on the sending unit in the next few days. I have a 400 mile trip to make, in my daily driver, so that is going to wipe me out for a few days, but then I will get to working on the vent lines and stuff.

I also plan on putting a heat shield tube around the fuel line and the vent line that goes near the headers. If "all that" doesn't fix it... I will get the electric fuel pump too. I gotta put the vent line, open the filler neck vent, and put the heat shield anyway even if I need an electric fuel pump, but if I can get away without the electric pump, I would rather.

Thanks for all the help!