Probably little difference than a Cig 38. Same basic bottom and weight.

If you think about it, what else could you put on it? A III conversion would require major surgery and expense and you still have an obsolete drive with hard-to-find parts and expensive props. And the same power handling capacity but no warranty. You could do XR's but you'd need the same major surgery plus a motor move. Your prop and parts availability would be solved but my guess is you'd end up on a first-name basis with an outdrive tech. That boat's no flyweight. Don't forget a new set of tails for the exhaust with anything else.