Congrats on the new ride
1. you'll certainly feel the difference from the 4.6 v8
3. My '19 also came with 5w30 on the oil cap. but since gm changed the recommendations , my dealer has been putting 0w40.
4. Look out for lot's of people wanting to race ya. If there are recalls or tsb's; this is a good place for that sort of info.
Post up some pics when you get a chance, we'd love to see it.