RE: 100 or Bust
The CT040 mounts are the stock mounts for the CT4. The engine that is in there is a big block engine so the .21 should drop in. You might have to do some shimming on the clutch bell.
What I would do is drop the .21 in the CT4 using the stock engine mounts, clutch, flywheel, clutch bell, and exhaust system. Break the motor in and do some testing with the stock setup and then go from there.
I also suggest replacing the stock radio with at least a quality fm system.
rolland