Passing along info I have learned -

The return line must be at least as big as the supply line, minimum. Otherwise the return hose becomes the restriction. And if you are using a high GPH for application pump, it should be one size larger.

Tank to pump, one size larger minimum than supply line.

Tank vent minimum -8.

Much easier on the pump to maintain volume at <10psi than at >25psi.

We build a system to that spec, works perfectly. Fuel pressure rock steady on the Racepak. Fuel doesn't heat soak in the line. Put a diptube on the return in the tank, get a solid fuel flow with no aeration.

On a dead head system, fuel in the supply line just sitting there, for the most part, until the hit. What's that fuel weigh? It has to be accelerated in the line to meet the demands of the engine. Plus it has to be accelerated against the G forces of the car accelerating. With a return system, it's already moving.

I ran deadhead systems forever. They work. Won't anymore unless the guy insists. Heck, I have guys running low 9s at 3600# with Holley Blue pumps.

Tank in the front of the car makes things much easier.