You're welcome to convert your stock system to a parallel fuel rail system (like on my website), but it's going to cost you some serious cash.
You're probably not going to see serious gains doing this mod, but I guess you'll have peace-of-mind that your fuel system will be working at it's best efficiency.
The non-turbo 13B's biggest disadvantage to making lots of power is it's stock intake system.
You'll need to scrap the stock intake manifolds if you're going for serious power on an NA 13B.
Side note, the 13BT maxes out the stock 4 x 550's at a hair under 250hp at the wheels on a DynoJet as a conservative number.
I'd serious doubt 4 x 460's could hit 300 at the wheels even at best case on an NA 13B.
-Ted