From what I can see, the pre-'67 Imperial platform dates back to 1957, when it was "fully modern" in all aspects. Most probably a lengthened version of the "full-size" platform of the pre-UniBody car? There were NO cars other then "full-size" at that time.
In those earlier times, for many decades, Chrysler had followed GM as to car price classes of vehicles, top to bottom. Plymouth, Dodge. DeSoto, Chrysler, and Imperial versus Chevrolet, Pontiac, Oldsmobile, Buick, and Cadillac . . . loe to high. By comparison, there were Ford, Mercury, LIncoln (with the "Continental" sometimes being a separate line or a Lincoln model, depending upon the model year).
With the 1964-1966 Imperials, Chrysler went all-out in their efforts to gain sales from Cadillac. Real wood on the interior. Better fabrics and such, too. Yet still maintain the best Chrysler traits at the same time. Not that many Cadillac owners noticed, so the decision was probably made to put the Imperial onto an upgraded C-body platform. "Upgraded" in ways other than just a longer wheelbase, as the added wheelbase was not in the "cabin", but in the front stub-frame and fody sheet metal dimensions.
"AI" is NOT the infallible resource many perceive it to be! At the university level, many students have used it to generate term papers. ONE giveaway to the professor that a paper has been AI-generated is the use of footnotes which are totally FALSE. AI-generated out of thin air. Not to mention the word choice and word patterns used in the papar.
When AI "scrapes" the Internet for information, it will find disinformation or bad information presented as "good information", so it puts that into the database too. The more it "sees" something which is bad information, repeated from ONE source into many other comments it has found, it can become QUITE EASY to spread disinformation as real, solid facts!
SO . . . AI just regurgitates information it has found. No more, no less. It is STILL up to the user to determine if what is found is accurate and correct!
Just like when some chain auto supplies said "Bring you Check Engine light to us to see what's causing it". So they pulled the codes (free of charge) and presented a list of the needed parts (as this was a sales technique for them to sell more parts!). One malfunction could trigger a multitude of codes! Getting to that main code required operational knowledge of why that one code happened! Just like in the OLD DAYS, you had to know how things worked! Their computer coding was not so advanced that it could recommend the MAIN CODE that caused all of the other codes, at that time.
Y'all enjoy!
CBODY67