FiTech EFI system

I'm thinking about getting the Fitech 600 or 800 hp version for my 408. 408 was dynoed at 523 hp. It runs on 91 octane. I have an MSD ready to run Distributor. I'm getting a little tired of the carb and had problems autocrossing with it this weekend. Sure, I could fix the carb, but I like fuel injection just in general.

Anyway, I have a couple of questions. I am currently running a stock tank, to an electric pump, to a pressure regulator feeding the carb. My question is, should I get the fuel command center and run a returnless setup from the regulated fuel pressure? Or should I remove the pressure regulator and create a return line to the tank? Is there an easy way of doing so with the stock tank?

Is there anything I should be worried about?