Simple story, rebuilt 347, first oil change to 5/30 royal purple, about 15 mile drive home, got on just a lil to reach speed limit and let off throttle at that point, huge puff of blue smoke? Got home and every time I gas it no smoke til I let off but just for a second, let it sit a couple days cause I've been busy , start it and rev it and no more smoking? What happened, did I possibly over fill it, 7 quart pan, and put in 8 ? Or is it a broke oil ring? I'm stumped