Hot Fuel Lines
Do check the coil and/or igntion box for reduced spark when hot. I've had that issue too! But not with new MSD parts.
I put the regulator on the inner fender, sort of beside the heater motor. Fuel lines enter/exit inside frame rail between the header. The fuel has no chance to pick up much, if any, heat... it is going in and out of the regulator so fast. I did use -6 AN S/S hose everywhere, that could act as insulation I suppose. The regulator is an Aeromotive #13351. I picked it because you can use it for EFI (20-60 PSI) or carburetor (3-20 PSI). I am running a 780 "3310" Holley with no heat shields at all, just a 1/4" phenolic gasket. Also using an in-tank 60 psi Walbro pump with a Tanks Inc. gas tank. This solved all my "runing out of gas when hot" problems. Going on several Summers now, and it was well worth the investment.
Do check the coil and/or igntion box for reduced spark when hot. I've had that issue too! But not with new MSD parts.