Fuel hose AN6 or AN8

pittsburghracer said
I never used a return style regulator in 45 years of racing and I’ve been 8.42@160mph. Why do you feel they are needed.

I didn't either. Most all 80's carbureted cars came with a return? They added the upgraded filter and a return line. I could not believe the difference. Tap the key through the window and it fired right up any time.

Note the return on this filter . You see it on many 80's mopars.