Tendency is always to buy a very large engine for the 'get home against all odds no matter what current/ wind/ or storm'. Try to avoid that. 22' is a tiny boat (in that is very senstive to changes in trim ballast) and a big engine will change trim a lot and dramaticly affect sailing ability. If you do get a huge tugboat sized outboard then at least be sure to have some shifting ballast (maybe 150lb lead shot in bags) so that in spite of your weight and engine's weight you can get the boat back on her proper water line. That makes a HUGE difference when trying to REALLY sail. IF conditions are so bad that you cannot make progress than be prepared to anchor and wait. That's asking too much for most folks I realize!
If you want a power boat that sails then get a motor sailer. They are a great choice and some very nice small ones are made, but try not to hang about 75lbs on the extreame end of a tiny 22' vessel.
Ideal would be a 2-4 hp light weight with a VERY long shaft (25" to 30"). Unfortunatly, 25" seems to be the longest standard shaft and they are rare. 20" is usually sold as LONG shaft. Years ago I had a Tohatsu 8hp w/ 25" shaft and alternator and it was a good engine but heavy (64lbs) and that was on a 26 foot pearson (old full keel - Carl Alberg type). It was a bear to get on and off even for a 40+ year old in good shape.
These days my favorite engine is 2hp honda 4stoke air cooled that I can lift with one hand and is very easy to mount most anywhere. The shaft is only 20" but as there is no water pump in the lower unit it is theoretically easy to make an extension to lengthen the shaft/lower unit, so that is a fantasy project for me. When sailiing, (20' marshall cat boat)I have a good anchor and line/chain and take water, a sandwich and good jacket so as to be prepared to be stuck for a bit sometimes, SELDOM EVER HAPPENS, and we have some 3 to 4 knot currents in the Cape Fear River.
Check Out this book ( 10 STARS !!!)
Wind and Tide: An Introduction to Cruising in Pure Sailing Craft
By Jerome W FitzGerald