Mounted the factory fuel pump

Ok if I run the camaro pump in my tank with a carbed 5.9 I'll need a regulator up by the engine and a return line correct? And what if I run a 5.9 with stock MPFI with the return less fuel rails, will I need a regulator and return line there as well? I've been lookin up different stuff and the camaro pumps are regulated at 58 psi and the 5.9s are regulated at around 50 psi. I'm guessing I'll need a regulator for either setup correct? Or just install that magnum pump instead of the LS1 pump...