Under bed fuel tank, front of bed?

[Eagle Kammback]

Yeah, I know fuel tanks have been covered to hell and back here, but I can't find this answer specifically.
I really wanna switch to fuel injection, but I don't want a high pressure pump inside the cab with me. I also don't like the idea of my tank being behind the rear axle in case of rear end collision, plus I wanna put my spare there, plus weight balance, less wiring, less fuel line, etc.
My truck is a 72 C25 2WD long bed, stock height, and she has the auxiliary tank on each side, so I'd also like the fuel filler location to be on those doors (maybe one filler on each side?)
I'm assuming people don't do this because mostly the short beds are modified, but I also love the utility of my long bed.
If this isn't possible, what would you recommend? The Boyd and Holley tanks are wildly expensive, and I wanna still use the factory fuel gauge.
I've heard of people using 80s 25 gallon Blazer tanks, but what all is needed to hang it? I also assume I'd have to have another hole cut out for the sending unit in addition to the pump.
Thanks y'all