1963 Dart Restoration Questions

Why not keep it just as dad had it, /6 & push button ?

DODGE CARS - DART - 1963-1966 - Auto Body Specialties

For floorpans, body panels are pretty limited reproduction.
The /6 is already gone and his plan before he passed was to hot rod it so figured I’d respectfully make it a little more rowdy without getting to carried away.