'64 EFI Rear Tank Options Help

[IdahoC10]

I have done a lot of searching on a EFI compatible rear fuel tank for my '64. I just haven't been able to find everything that I am looking for in one tank. I would like to find a rear mount tank that doesn't hang down like a soggy diaper yet still offers decent range (20gal?), is compatible with EFI, compatible with a fuel sending unit to work with my 5.3 ECM, is not a bed floor fill, and doesn't cost $400 for just the tank.

I thought about the blazer tank as it is inexpensive, has a side fill, holds a decent amount of fuel, and can be bought with mounting straps. BUT, I don't like how it hangs down, don't know if it can be use with EFI, and if the fuel sending unit is compatible with my 5.3 ECM.

Can you guys help me with some ideas that should work?