You'll probably have to buy new wheels to get an "innie" in a 15", I would go with chrome lug nuts and bullet centers.
His front looks to be an innie. His back is an outie. Ya just have to look for em.
Those flames are HOT! Yeah, something like that would look killer on your patina.
If you took the bumper off, either cut the frame horns off and fill in the gaps or use some kind of diamond plate 1/4 bumpers or the like. No need to roll it, the pan looks pretty good as is because of the rounded rear quarters.