I don't think my 10 hp Evinrude would be big enough for your Monterrey. But, if you are still interested, message me on my Facebook; Steve Cook Wildwood or Grover, MO I have 2 items on Marketplace where you can find me also; "Flat Swingset Swing " or "Chile Glider Swing". I'll give you my phone...
I'm in Grover, MO, the motor is at my man-cave in St. Clair, MO. Mile marker 242 off of I-44. This would be an awesome combo! In the next few days I'll get this on FB Marketplace so you can see the pictures of what nice shape it is in.
I have a 1959 Evinrude 10 HP Sportwin that I bought a few years ago at an estate sale. It belonged to a very old man who is long gone and it has not been run in years. I checked compression and its 105 in each cylinder. There is no spark, so I suspect points or magnetos. F-N-R all function...