Hello Mike: I'm not exactly sure which roads in Quebec you are considering, but if you head north from Burlington Vermont, you will be south of Montreal. I van advise that the Trans Canada Hi-way, the #20, is a very good road, quite straight and level from Montreal to Riviere Du Loup, where it turns south into New Brunswick. It may be further North than you prefer, but if you are looking for scenery, the views along the St. Lawrence River, are pastoral and the fall foliage is a continuation of the New England display.
We traveled the #20 last summer along the St Lawrence to the tip of the Gaspe, and once you are past Riviere du Loup, it becomes very curvy and mountainous, but extremely scenic as the road hugs the St Lawrence, as it follows the coastline through small fishing villages and over some very steep hills.
I'm not sure if this is helpful, but I think as you travel in Quebec the terrain becomes more mountainous the closer you get to the borders of Vermont, New Hampshire and Maine.