'85 C-20 454 Vapor lock?

[Dave]

I have an '85 C20 with a 454 when idling in hot outside temps, the gas will start to boil. Running about 9.5 cr, 400 hp, w/ ceramic headers, 180 stat, 4 core rad w/ dual electric fans, trans and oil coolers.

Installed s/s braided gas line from mech. pump to carb, still wants to vapor lock. I never knew this, but I found a C-30 with a factory fuel line on the outside of the frame rail, then comes over top of the frame transitioning into a rubber hose back to the fuel pump.

Is this what I need? Anyone else experience this problem?

Thanks..