rack n pinion front steer ackerman issues...explain...

yeah, the Plymouth can be somewhat of an Odd duck since it had independent suspension from the factory. even the mustang II swap usually involves a stub for the Plymouth. they sell dropped uprights and rack kits. I just don't know that they will fit my bill.
I would really like to add some handling to the old girl and some stopping power.
the mustang II kits offer plenty of brake choices.