The 427 in my Mach dynoed at 497hp and I still use the entire stock 3/8" fuel system. The only 'upgrade' I have is an Edelbrock fuel pump. I haven't had any issues or seen any signs of running out of fuel on the strip. That's with a dual 4 intake, which likely uses more fuel than a single 4 during a run. Before spending a bunch of money on upgrading the fuel pick-up and feed, I think I'd try the stock system and see if it works. Worst case scenario is you find out you need to go bigger, but it might save you several hundred dollars if you find it works okay.