I have two tanks to choose from.
My first choice will be a huge 79 suburban tank I got off my donor - similar to the blazer:
http://67-72chevytrucks.com/vboard/s...d.php?t=474448
If I don't like how it's coming together, I got one off of the F250 that I got the service box off of. It's looks to be about half the depth of the suburban tank.
I'll try and load some pics of the tanks this afternoon.