427 would be nice, with dual exhaust of course..
(Dad used to have 64 Galaxie 500XL, 427 8V... B) )
300hp base engine would be useful.
How about 3rd row seating and a Magic Doorgate?? :D
On the sedans, put the spare under a trap door like a Taurus, flip down rear seats.
'64 Galaxie taillights, with LEDs for better visibility
IRS, with conmensurate tow ratings, like Explorer/Expedition. Makes no sense that the cars are rated at 2000 lbs, when trucks with the same drivetrain are rated much higher. My 88 351W was rated at 6000 lbs, with 2.73 gears!
How about run past the Mopars?