What should I do for a gas tank??

[71ChevySS(straight6)]

Hello again, everyone! So, basically, here's my situation: the truck has the stock tank behind the seat, 44 years old now, and the only thing holding fuel in is 20-year-old JB Weld. I want to move it. Here's where I start getting options. I can either,

A) spend the money and buy a relocation kit,

B) buy a Blazer tank and modify a few things myself to make it work,

C) get a fuel cell or use something as a cell (keg, etc),

D) get another stock tank and locate it in the front of the bed, and build a sheetmetal shroud around it. This is the option I'm considering the most, seeing as I have a guy that will give me a like-new one for free, I just have to pay shipping.

What do you guys think I should do? Thoughts, suggestions, ideas are all welcome!