new to this forum and needing info on relocating gas tank

[mustanglx347]

Hello all, finally found a good info site for my two trucks (71 chevy stepside swb and 1950 chevy 5 window). I am working on my '71 at the moment and i currently have an RCI fuel cell in the bed but would like to actually relocate a gas tank between the rear frame rails under the bed.

My question is, does anyone make a kit, or can I use a tank out of a blazer or suburban? Is there a tech write up on this project anywhere?

Thanks in advance