Hi ICMFO,
Just seems to be a huge overkill on a machine of that smaller size. When you think that SB used a 2 Hp powered Briggs on the 14 inch machine the engine you've selected is just way over the top. If you had a 20 inch Scotty I'd say OK, anyway your call.
BTW, you might find that the engine will not physically fit onto the machine due to its sloper design and thus clashing with the handlebar. You would require a set of handle adaptor plates to space the handlebar out from the chassis.
Cheers,
BB.