Hi William and welcome to the forum.
By strange chance I have played with something remarkably similar a cuple of years ago.
The cat was purchased by someone who just wanted the outboards (he bought two cats!) as buying the boats complete with r/c and so on was cheaper than buying the same spec outboards on their own>
He was going to bin the hulls but I grabbed one off him for a fiver (minus the gear of course).
I have put a simple brushed speed 600 in there with a short shaft, shaft level with the estimated waterline when planing, and fitted a Graupner P50 hydro prop. It goes quite well, fast enough really and I have not felt the urge yet to replace the motor with anything hotter.
Ashley