one more quick fuel issue...

I dont know it any you remember, but the last fuel pump (msd) i brought broke when I dropped it. (internally) So I am ordering a holley 255lph intank tonight. As for the rest of the fuel system, it has 440 injectors, rail, regulator, and fmu. My question is, I dont have the stock regulator to put back on as suggested. With all the extra pressure and rr fmu, what psi should I set the regulator for. I just want it to get enough fuel, in theory with the fmu ajusting the reg shouldnt make any difference, right?