After market fuel pump and pick up install help needed

[Real Hummer]

I removed fuel tank and was looking for some ideas as to where to drill hole for return and feed. I am going to use bulkheads but unsure what I should do in the tank. should I make a pick-up tube and where should I try to pull from. On a drag race tank it is on rear center so I guess this would work. I assume I have to leave ols strainer in tank for gauge but will oem wiring and relay support power for new pump. I thought I would tap into oem power source and leave oem pump in tank. Where is a good location to mount external pump
Thanks
Bob Hummer