Re: Jackplate

If the screws and circular plates will fit inside the jackplate, then the engine will mount. You need at least 4 inches clearance inside the jackplate OR (not easy or good) you need to cut down the screws some.
HOWEVER: You will need to thicken the jackplate mounting plate with a slug of aluminum--say 2 inch by 1 inch by 12-13 inches long. It must be at least 1 1/2 inches in total thickness for the screws to reach and clamp tight.
This is not a jackplate but you can see that if the transom is too thin. the clamps will close all the way without grabbing.