http://www.classiccarautoparts.com/
If you need a gas tank or sending unit - these guys were good to me. I don't like ordering on the web from small sites, so I called them. It's a business that is run after hours so call them in the evening. The guy that helped me was really nice... so a week later I ordered on the site. They have a PayPal shopping cart that was really easy to use.
After I made the order, I emailed just to make sure that I got the right parts - I got a quick answer back
Joe