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Steve same thing I did. 1981 Montauk17 had a 1981 Evinrude 70 hp 2 cycle. changed to a Suzuki DF 70 i believe the holes will match or i think they will. my Df70 is a little low but not worth moving it up IMHO WOT 35-36 mph plenty fast enough for me. I have a factory manual if you need to see something, I can fax or scan then e mail. Good luck it's not that hard to do yourself like I did. Suzuki props are different unless they have changed the shaft from 2000... I'm running a 14x19pitch on mine.