Welcome to the Team Jeff!
Many people buy the car of their dreams and only after they have invested their hard earned cash do they look to see how they are going to get it their dream car into shape. In doing so they often find a much better project car once they widen their perspective ( a Bel Air or Biscayne instead of an Impala for less money in better shape, but without the desired SS interior), and attempt to combine the two cars.
Even a four door can contribute valuable parts if you can buy it cheap enough (just about everything forward of the front doors is the same). So you could find a big block wagon somewhere to put more muscle into your SS impala project, or at least one with prettier ,shinier trim parts such as bumpers and grills. .