Identifying frame #'s

[kz1000]

Hello, new to the forum and trying to identify what I have, I do know that I have 3, 41-42 WC's, 1 was completely disassembled down to every nut and bolt, I have enough parts for 2 complete trucks plus plenty of NOS and used parts.

One frame I have is numbered 8680223, can someone tell me exactly what I have.

Also, what are the tell tale differences between the 1/2 ton and 3/4 ton frames on these years.

[dieseldude4bt]

1/2 ton frame is almost flat until you get to the rear tires, it also is narrow in front and gets wider to the front rear spring hanger.