Well Willy, this one can go either way, but you know your guess is pretty good. Cubs do have the home field. The oddsmakers are going to take that into effect..They will also just have beaten the Braves in the series too, which they will also take into effect. And most important.... the cubs will be a popular team amongst bettors, and nobody really cares for the small market Marlins, so even though the Marlins did have the better record, you do have to make the Cubbies the favorite here..
So your -145 is a good guess.. and I will go with Cubs -155/+135, even though the real line here should be ONLY Cubs -125 to -130.. But because the whole world is going to be playing Chicago, that is why I am going with the Cubs -155.
maybe I'm wrong.. but we will find out very soon..