Even the Minnesota DMV wants to call any street rod with a reproduction body a kit car. Better to go along to get along than to irritate them by trying teaching them something.
My dragster is powered by a 300 cu. in. Ford 6. A truck motor. As a joke I cut the stamped "Cadillac" script out of a valve cover and welded on the modified Ford cover. Had to be modified to clear roller rockers. One time at the drag strip two older guys, men that should know better, were looking at the car. One said it had a Cadillac engine. The other said, "No dummy, can't you see it's a Chevy engine?"
So many people have thought it's an in-line Caddy 6 (never made anything like that) that it's embarrassing.