I know this is an old post, but I am just trying to get my post count up.
You will need a robust EFI fuel pump, like the mentioned Walbro 255, or a Bosch 044, or AEM or whatever (lots of options out there). This pump should be run off its own dedicated power source using a relay and 15 or 20 A fuse.
Unless you are going to cut apart your stock fuel tank, that pump will probably be mounted under the car near the fuel tank. It will suck fuel out of the tank and send it high pressure, through a 10 micron filter, to the engine. The return fuel from the regulator then needs a nice restriction-free path back to the tank.
5/16 feed line work fine for your power numbers.
The stock tank is terrible for preventing fuel slosh/starvation, so just be aware of that.
One thing to check is to make sure your fuel pressure is within the stock parameters after your fuel system is set up. Sometimes a high-flow pump can be too much for the OEM regulator, and it cant't bleed off fuel fast enough to keep pressure down. If you are getting a new tune, then fuel pressure becomes less of an issue because the tuner can compensate in the software.