Ok im changin my 86 f150 from efi to carb. Im at the point where im figuring out my fuel delivery. I have the in-tank pump as well as a high pressure pump on the frame. I know the high pressure pump has to go no question.

Can i use my stock in-tank pump with an adjustable pressure regulator to get it down to about 5 psi?

If not can i just cut the power to the pump and put an inline low pressure pump and be fine?