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I'm working on my 47 Ford coupe and thinking about using a 60s Mustang gas tank and it's going to be a snug fit (cut the rotted floor and drop the tank in place.). I'm thinking to get it to fit I'll have to trim the flange on the tank in certain parts. My biggest concern is trimming the flange too close to the weld.
My thinking is to use the Mustang tank to double it as the trunk floor.
I don't see anything wrong with the idea, especially if you're thinking a new tank. Guys put them in pickup truck builds a lot, tank sitting on a flat flange of the bed floor, or sometimes beneath the bed floor depending on the look they want. I'd try to cut the floor out to leave the tank flange alone, or massage it to clear as opposed to cutting as much as possible for support. Check YouTube, Mustang Gas Tank in a Hot Rod.
Not the best pic, but it gives you an idea of what I'm trying to do.
http://www.clubhotrod.com/photopost/...umbs/tank2.jpg