Are longhorn beds actually longer?

[1971 cheburban]

I think I have a longhorn/camper special bed. It came off of a 1970 GMC 3/4 ton. It had heavy leaf springs, the regular 3/4 ton just had heavy coil springs right? Plus I measured the bed and it is 8'6" long and it was on my 127 inch wheel base truck and the wheel base looked like it was off, one reason it worried me was because my truck was cut in half and rewelded so I thought it was off. But it was the bed that was making it look wrong it's actually 127". Is the wheel well on a camper special farther back than a regular 127 inch bed, or what?