Is there anything special to look out for when inspecting a 1970 Dart Swinger?

Young family with toddlers, and don't have the financial ability to do a project car ? With all due respect, it sounds like you have way more to concentrate on than to buy a clapped out car with an asking price of 3 times what its worth. Save your money on this one.
Johnny Dart says it best.
Pump the brakes on this car. Be patient and find a ‘no brainer’ for the same dough. They do come along every once in a while, you just have to keep on looking!