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It looks like you are using a clamp-on motor. If you are not converting to bolt-thru, need some thin plywood for the clamps to "bite" into. Also recommend using some on the back of transom, like a "wear" plate, like what was there on oem transom. I agree that the transom height should be fine. When looking at new jon boats a few years ago, short shaft transoms were only available on 14' boats or less. If you are going to push HP limits, might want to see if you can mod/change/add the angle braces, such that the tie into the transom at a higher point. Maybe beefing up the corner braces, too.
It looks like you are using a clamp-on motor. If you are not converting to bolt-thru, need some thin plywood for the clamps to "bite" into. Also recommend using some on the back of transom, like a "wear" plate, like what was there on oem transom.
I agree that the transom height should be fine. When looking at new jon boats a few years ago, short shaft transoms were only available on 14' boats or less. If you are going to push HP limits, might want to see if you can mod/change/add the angle braces, such that the tie into the transom at a higher point. Maybe beefing up the corner braces, too.