Glad to help
Here's the page at Hamtramck Historical http://www.hamtramck-historical.com/PassengerCarBumperHeights-01.shtml
Note that on page two that these are for fully loaded (5 passengers, full fuel) but does not say what options. Also the bumpers are somewhat adjustable and the body has some uh slop. My suggestion is get the chassis/suspension into the factory ride height spec first. Lie on the ground with a flat backed tape measure. Not that hard. Then see where the bumpers are. Make decisions from there.
Another shop manual page posted here. http://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/7937384/site_id/1
