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Welcome. I agree that you should raise the motor 2 hole up. As to the prop, I have searched and not found the prop info on the SS prop I gave my son in law for his Montauk. His motor was a 90 hp Merc of about the same age as yours.

All I can offer is the following. My 16'7" [not Montauk] has a 17K prop which is Yamaha painted ss the motor is 90 hp 2- stroke Yamaha.

I would definitely buy stainless. At least where I live there are many used for sale at very good prices. Once you are confident what you need that is a good way to go.

Prop experts will chime in hopefully.