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Hi Scott,
I have a Yamaha F70 mounted on my 1988 Montauk 17, and am quite happy with it. The motor is mounted 3 holes up, and I am running a Stiletto 13.25" x 13" prop. It seems to be a bit under-propped, as I can pretty easily get the motor to rev-limit. The boat can reach 36MPH with me (220#, but I'm working on it) and 23gal of fuel. Best planing milage is 7.5-8 MPG cruising at 21MPH, around 4000RPM. Between the lightness of the Yamaha and moving the battery to the console, the boat now rides 2-3" higher in the stern that it did previously.

Hope this helps.

Dennis