[87 V20 Scottsdale]

It's more than likely a C30, since it's a tow truck. It looks to me like the rear of the bed has been cut down to accomodate the wrecker equipment. Maybe it's an illusion.

There used to be a handful of these running around here. There was a guy I went to high school with that had an '86 C20 LWB stepside. I remember it had a 454, and I think was a Custom Deluxe. He sold it to someone that had another LWB stepside, a 70's C10 that was a former Overnite Express fleet truck.