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.
Is wheelbase a thing?
1973-78 LTD wheelbase: 121"
1977-79 LTD II wheelbase: 117.9"
1979-91 LTD/Crown Victoria wheelbase: 114.3"
1992-09 Crown Victoria wheelbase: 114.6"
Kind of casts a doubt on the accuracy of the rest of your information. Or I guess those body swaps looked pretty funny with the wheels hitting the wheel wells, huh?
so the rules are still the same. You fail again.
Well you fail math!