I got mine from LMC and it was about $200 plus additional hardware from Lowes. I also bought 25' of 3/8" fuel line from Summit and ran it to the pump.
Do a search for surplus blazer tank in this forum to get more info but here is the FAQ:
http://67-72chevytrucks.com/vboard/s...us+blazer+tank
I noticed the Maine tags. Where will you be taking leave? You will definitely need help to get it done in 1 day.