67Monaco
Old Man with a Hat
Technically, it's not and my example is a lot closer to reality. Your Glock example is an exchange of parts without metalwork, and your C-body example (beyond the obvious differences in body lines which would inhibit things like doors opening, etc.) moves far from "plug 'n play".
The commonality between C-bodies, especially in their first generation ('65-'68) are items like mechanical parts and some glass, not exterior panels and trim.
If you expect to swap those around, you'll need grinders, torches, etc. And if you are asking an Internet forum, you probably lack the skill to produce much more than scrap. Somewhere on this forum you'll find a person with big plans to change his whole front and rear suspension, who then became stumped by removing the radio. What do you suppose the odds are of that car ending up no more than a pile of damaged parts?
Everybody's got to start somewhere. No one did anything they were instantly an expert at. Better to ask first than to ask after you're *** deep in crap.