Here it is with the Camaro rear end mocked up.
The first thing I did was cut the front frame horns off as well as all the cab mounts. I used a sawzall for all of these cuts.
Following others builds for this process I marked the frame to be cut about 1/2 in aft of the forward end of the steering box. As it turns out this was exactly 5 inches from the back of the S10 fender mount.
Steering box bolted back up
May need some tweeking but this should get me close.