I used the one that CPP sells...not too happy with it. The fill neck comes out right at the frame rail and in order to route the fill hose, I had to notch the frame rail and run some hose up the inner wheel well. I like the "stealth" look of the fill point, but I'm still bitter about having to notch the frame.
Another point of dislike is how low the tank sits. It almost entirely covers the rear diff cover. I know that there are some Stainless options out there, and custom tanks as well but I don't think I even want to know how much $$$ that costs!
Ricks tanks fabbed up a stainless tank for my Camaro project that is truly a work of art--but I am paying for that one! Since the '63 is my parts runner for now it gets the cheapie parts. Once the Camaro is done, the C10 will get the primo parts as well.
If you want to try Ricks,
http://www.rickstanks.com/. Hector is the guy to talk to.