What type and size hull? Is it an inflatable like in the example? The block idea looks like it would work for one inch, not sure about two...
The jack plate mentioned above was designed for a motor that size, but I'm running a Bob's Machine Shop mini manual jack plate and I can tell you if I were to do it over, I would go with two pieces of 1" x 2" x 3/8" aluminum angle bolted through the stern sheet, elevating the motor, but not setting it back. If you're working with a short jon boat, (less than 16'), you may not like the effects you get from setting the motor back. Especially if you can't distribute the weight inside the boat evenly.
2015 Tracker Grizzly 1448 MVX
1996 Evinrude 25hp 3 cylinder looper