If you can weld I would suggest doing it yourself, there's a lot of great help on here and with that frame you're gonna have to do all the mounts and tabs anyways. This way you'll get what you want and it's easier to change stuff around. You could order all the crossmembers and mounts and just build your own rails. That's part of the fun anyways.

Check out Brians link here there's enough info to get ya going.

http://www.clubhotrod.com/forums/showthread.php?t=28617

Sean