Under bed fuel tank on 1966 C10

[mjc1966c10]

Hello, I'm new to this forum, and have just started restoring a 1966 C10.

My first step is relocating the fuel tank from the cab, to under the bed. I purchased a 19 gallon aluminum tank and I need to find clear instructions for installing it. I don't have experience with this at all.

My initial questions are about the overflow hose...
how do I set up the overflow hose?
Is there a specific valve outlet that I need to use?
How long of hose is needed?
Where does the hose run and lead to?

I appreciate any help (links and/or pics) you can give me.
Thank you
Gabe