Fuel System
 

I wanted to upgrade my fuel system to be able to handle alot more hp in anticipation of my upgrades. Can i upgrade it before my engine is rebuilt or will it cause problems because it doesnt need the much fuel yet. I plan on making about 650 hp

Yes you can upgrade it, although I wouldn't upgrade the injectors till your ready to get it tuned, because you'll need to retune it for the larger injectors and thats just a waste of time an money to do twice. You can upgrade the pump(s), lines, rails and regulator though If you want.

So i could put a triple fuel pump in there now and be ok

And what is the return style is it better

It's just a return line off of the fuel rail back to the tank. Your stock fuel system doesn't have a return setup if the vehicle in your sig is your. Yes you can put a dual or triple pump hat in and be fine, the regulator holds pressure and the pumps won't work hard at all to feed an n/a motor.