I'm using the harness from the 88 k3500 chassis, the harness from the 91 c1500 is mostly missing, was chopped when someone took the power train, but I still have the block. I played with the block a little bit last week and it didn't come apart for me, I'll look into that a little more today.
Thanks, I'll just make a cardboard stencil off the old cab and sawzaw it out. Or is there an easier way to do it? I've never done anything like this before.