Two plans are mentioned.
Plan 1385 appears to be a Plan of Subdivision.
Plan 67R-3578 is a Reference Plan.
In any event the plans will state the description of the underlying land.
The surveyor who did the survey and registered the plans would likely help you pinpoint the location.
Hillborn is a common Preston (now Cambridge) name.
You might also contact a lawyer or title searcher who could obtain copies of these plans for you.