help with gas tank options

[twangismythang]

I have a few tanks that came with my truck that was bought as a project and not sure which way to go. The first picture is what I think is a blazer tank, the second is a plastic fuel cell that was mounted in the bed. Being that this is a truck I don't want to mount anything in the bed, plus the plastic just doesn't seem like a good idea for durability. I would like to do the camaro tank conversion, but if I have something here I could use, I would rather save the money. I have not found a thread that give details on the blazer tank conversion. If anyone could send me a link to this conversion or offer any ideas it would really help give me some direction.