John
A lot depends on what you're going to do with your project. I was going to replace my rear diff and suspension along with installing an IFS so pretty much everything had to go rivets and all except those needed cross members. You didn't say if you were planning on a restore or an upgrade. My finished frame is linked below. Good luck!

http://good-times.webshots.com/photo/2468275250099708909yMPppY


~Jim