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Hello Bru, if this model is a "Sport" then it cannot be a Montauk model.
Those are two completely different models.

17' Sport 1976-1983
https://www.whalercentral.com/userpho...lbum_id=46

17' Montauk 1973-2002
https://www.whalercentral.com/userpho...lbum_id=14

For the engine mounting, we have those diagrams in our Article section. Take a look.
https://www.whalercentral.com/article...icle_id=82

Measure 2 or 3 times both inside and out before drilling.
See this members personal page.
https://www.whalercentral.com/infusio...ser_id=291