Vin question

Hey all,
I have a question for you guys. I have two 73 dusters. One in really good condition, but it is a 318 column shifter, 50/50 bench, little rear end and maybe a 904 havnt really checked that one. The other duster is a H code car. buckets center console slap shifter, has the bullet mirrors. but the body is shot, and I mean Shot bad. So my question is, 1: is it illegal to restore the H code useing the other cars body, switching vins and then useing almost everything from the H code; Is it ethical ? 2: if it is ok, should I ? 3: where are all the vins ? What do i do with the roted body and what do i do with the paper work for the other car that the body has been used

I would be thankful to all your opionions,

Thanks