Crown Vic's are only around ~114" and the Town Cars didn't have THAT much bigger doors/more rear leg room.
WB on these trucks is 133, so there's definitely something funny going on.
If someone were going to lengthen the Lincoln frame they wouldn't overshoot by that much intentionally.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.