Fuel Line Choice and size

Rat Bastid said

I can’t think of a reason why anyone making over 400 hp would ever use a mechanical pump, and why you wouldn’t buy the biggest pump and run a return system is beyond me. Aside from the initial investment there is no reason not to do it. It’s just a better system.

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Many came that way, mechanical pump.
Now switch mechanical pump to belt driven water pump. Aside from that comparison imo its the line between race or race tech meets street/strip or hotrodder.
I'm all for 3/8 line and its jmo anyways.. but that's why I asked the question of our members who have switched while maintaining the same motor combination.
Or a dyno test. Maybe engine last'rs tested this already. In sure it's been done and the outcome circulated..and misapplied interpreted 6 ways to Sunday.