I personally prefer the nova clip myself as well. I have a 53 GMC that has a 76 Nova clip and have done a 53 Chevy with a 74 Camaro. It is very intense on the Fab part. Measure 2x then measure again then cut. I used the front cross member form the 53 to mount the front end but had to fab up supports to mount it to the Nova frame and work around the front steer box.
If you use a S10 (I have not done this myself, but have seen a few up close), find an extended cab and separate the rear frame section at the factory seam. Cut the needed amount from the front section to make the wheelbase correct then re-insert the rear section and re-weld. Then the fun starts
You will have to fab up all the body mounts and front sheet metal mounts. You can use the ones from your original frame as patterns.