I was taught when you want to run 12's you need to upgrade to 1/2 inch fuel line....that was forty years ago and pump technology has changed a bunch but that rule never failed me.
At 500 HP I'd think 1/2 would be helpful. I ran 1/2 with a hidden baffled pick up drawing from the front of the tank with a Holley blue pump for years. That worked fine for low ten second ET's but once we upgraded to nine second power I added a sump and better fuel pump to make things happy.
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