Question about milage w/ an engine replaced

I was recently looking at a dodge charger that has 170,000 miles, but the engine was replaced at 140,000 miles. When comparing this to other vehicles I am looking at, should I consider it comparable to a car with 170,000 miles, 30,000 miles, or somewhere in between? I would guess somewhere in between since an engine replace doesn't negate the wear on the rest of the car. But i'm not really sure how to take this into account when comparing to other cars or considering price. via /r/cars http://ift.tt/2tf2EsU