Some of the 22's were sold with 50 hp. They could achieve a plane at 12 to 14 mph. The 75 was the most common engine, and that was what the boats were designed around initially. You won't do as fast, but it suffices for cruising in the high teens. If you plan Lake Powell, or other higher elevations, you do loose significant HP, and the 75 is not going to be a speed machine. I feel that both trim tabs and the Permitrim are very desirable for getting the boat on a level plane, and nose down for going into chop.
The 75 is most likely a carbureted engine, so you will want to run fuel out of the carbs or drain them unless you are using the boat in a couple of weeks. (Especially if ethanol laced fuel.
The 75 on the 22, is like the 130 on the 25--marginal but works. I had the 130 on my first 25, and went for the 150--For best results the 25 can use the 200 hp. Same on the 22 --115 hp is going to be better than the 90 hp, which is the most common engine.