Fuel system good enough for 525 hp?

The fuel line I would like to use is 6AN ptfe, but due to the ptfe core it has a .312 inner diameter. The tanks, inc fuel pump says it is good for 630 hp but has a 1/4" NPT supply outlet. The Holley sniper fuel fittings are 6AN. Seems like the 1/4" NPT fitting is the choke point. I guess I could run the next size 8AN fuel line with .401 ID but would it even increase flow with the smaller restrictions at the pump supply and the Sniper body? The smaller line would be easier to run and cheaper. All this is to feed a 408 stroker 525 hp. Thanks for any help.