Just for the record having looked at doing this to mine:
This engine had two midsection versions - the original "outside ram" and the newer "inside".
The inside ram version is basically the same leg as used by almost all 2 stroke Yams from about 50 -90 Hp. That is a simple case of removing the spacer at the bottom of the clamps along with the "manual assist" ram & retro fitting the (3 ram) PT unit in its place. (remmebering to add the pads for the outer rams to the swivel bracket).
For the outside ram version, 2 options are to either fnd a gubbed inside ram engine & swap the entire clamp / swivel assy. or if you can find them, fit a set of powered rams. The hydraulic unit to drive them is remarkably similar to the ones used for Mercruser leg trims, so one of them bolted to your transom with a few yards of hydraulic hose does that nicely. The problem is you will inevitably break the bolts holding the old rams in, and end up with miles of hose round your engine.