Well done, good tidy gob there looks great. I fitted a Honda GX160 5.5 in place of a 5 HP Briggs on my Merry Tiller Major, been well pleased with it over the last two seasons. Nothing wrong with the Briggs when it was running OK but it had become difficult to start and lacked power. I’ve since found out the valves were leaking, especially the exhaust. Reground valves, no wear on the bore so I left things as they were. Now picked up a M T with no engine after looking for some time. So be able to fit the briggs to see how it goes.
I’m sure you’ll be pleased with your Wizard when you try it out.