Here are all the parts to swap your King Cobra over to a Volvo Penta SX drive.
You may have to do a little work on the transom as the VPA transom shield is a little different than the King Cobra.
If this was just a cobra drive you would not have to replace the whole transom shield, but since it is you will have to replace the whole Transom shield.
You will need a new shift cable (around $75) as well.
I quoted you a prop, but we would need to double check that I got you the correct pitch.
If you wanted to go with a dual prop drive everything would be the same except you would need the DPS drive which is another $1,500 and a set of dual props for $750.
Look this over and please feel free to give me a call and we can discuss.