My bad. I thought we were playing by the same rules of the game when you said this about the Crown Vic:
Most car companies don’t keep making the same car with little to no improvements for 30 years, though.
With your new rules, you too would be awarded no points. You see, the Crown Vic as we know it now was first produced in 1992 model year, and is not even remotely the same car as a 30 year old LTD/Crown Victoria either.
Except that under the bodywork, the suspension and chassis are exactly the same as they were in 1977. There has been little to no significant change in the actual structure of the car since 1977, so the rules are still the same. You fail again.
You can (and some people have) swapped bodies between a 77 and an 02-up CV. It’s just like the Ford Ranger, except with the Ranger, they changed one bolt location. They didn’t change anything on the CV.
The Jags are unibody cars - and even then, the unibody design changed radically between the classic XJ and the XJ40 of 1988.