stepside 3/4 ton ???

hello all. im new here and looking to ask a odd question. did gm produce a stepside c/k 20 or 30 in the mid 80's? one of my best friends had a c20 back in high school and i thought it was one of the coolest rides around. i have seen this verson from time to time but have been unable to locate one anywhere. i didnt know if this was produced or if it was just a bed swap. and oh yea it was a long bed. any help with this would be greatly appreciated.