"This is a solid original, non-modified Bronco...I dropped a real strong built 1971 460 built with DOVE heads, RV cam and a badly need to be rejetted Holley Street Avenger carb."
FAIL! That would make it modified.
That was my first thought as well.
It's nice that he was honest to say he switched engines, but if you can do a swap you should be smart enough to know the vehicle is not original anymore lol.