Is it LEGAL????

So, you've learned your lesson.
Never, ever put a Challenger R/T VIN tag on a plain 73 Dart Sport.
It will show up as bogus in the Dart Sport registry.
(And mine will be worth less. Beaks rule.)
I've got years of experience as a professional idiot.
Jester - Wikipedia

Jesters could also give bad news to the King that no one else would dare deliver. In 1340, when the French fleet was destroyed at the Battle of Sluys by the English. Phillippe VI's jester told him the English sailors "don't even have the guts to jump into the water like our brave French".[7]