Other than the obvious like smog equipment, carb, and the assorted brackets and mounts that have to be transfered over from your '66 engine....you'll need to use the early distributor or convert the car to electronic ignition. check to see if the '80 motor has a distributor with vacuum advance as you will need one if you convert. You'll need a 3 wire neutral safety switch plug so you can splice your existing wiring into it. Use just the center wire on the 3 wire plug to attach to your single wire system. Use your existing kickdown linkage....it should swap over. Your existing exhaust pipe should bolt up the the later manifold too.
