Quart and a half is a lot of oil. I would think you would notice some serious smoke blowing, odor, or puddles. Did you change the oil yourself after the rebuild? I was having gears done in my Camaro and had them change the oil while it was on the lift. Within a few days I spun a f'ing bearing. They didn't add the proper amount of oil if any at all. I always do my own changes but didn't that time out of convenience.