70-72 Dart body shell.

Because it is not illegal to use a donor body. Maybe in Canada where it's illegal to defend yourself.
I am surprised by your response.
Seeing that you are in the business of buying and selling cars, parts, and restoring them.
You should know the laws.
There is a lot on the internet on this topic, and the general consensus (in the United States anyway), is that it is a felony to alter, replace, or swap a V.I.N. tag from one car to another and then represent it as the car that the V.I.N. is attached to and is referred to as a rebody. (which is technically illegal)
Here's a link to a discussion about this topic as seen by a well known legal expert in California.
https://www.shouselaw.com/ca/blog/laws/is-it-illegal-to-remove-a-vin-number/
I'll give you a pass on the ignorant comment about in Canada that it's ''illegal to defend yourself'' as nobody could be that stupid.

Perhaps a little research on your part is in order before posting on both topics...