Please do not make multiple posts of the same question. Sometimes it takes a few days to get a reply out of people or sometimes just nobody knows, regardless just stick to 1 post per topic please.. thank you.
I dont know about the engine horsepower etc but I can tell you that putting a new engine in a vehicle does not in any way mean that you get to reset the mileage, and besides that your putting in a used engine not a new engine. Either way it doesnt matter, the mileage stays the same, all of the rest of the vehicles components have a certain amount of miles on them and the engine is just 1 component of several, so the mileage stays the same. All you can do is keep records of the engine replacement and use these when selling the car as a selling point, thats about it.