All valid and good points by Burdar.
Although Ford beat Chrysler with the release of their shaker hood in 1969,
Chrysler began development of their shaker hood system earlier than Ford.
Even the oval air cleaner for use on B-bodies was being developed in December 1967 for future use.
The complexities of the E-body shaker hood itself and its understructure was likely enough in itself to forget development for use on an A or B-body
Mechanics hated working on shaker equipped cars...having to remove all that system just even for simple carb(s) adjustment.