Low fuel pressure with new fuel pump

I guess I can try to mount it up there. It’ll certainly be higher then the tank.. the previous owner had an Edelbrock 38gph pump mounted high, and it never made good enough pressure while driving. He says the motor needs to run at 6lbs or else it’ll lean the motor out and ruin it.
I did bypass the regulator when I put the holley red on there, but still made max 6.5 lbs and then it dropped to 5 after driving it up and down the street twice so I parked it.
My '71 swinger had enough room to mount on the frame just before the wheel well, that's forward of the axle