I love mopars, but you’ll get killed on parts, both availabilty and price. B bodies are completely out of sight. GM Pontiac Tempest might be an example of affordable. I assume authentic numbers matching stuff is out of the question.
C bodies can be affordable, but are a differebt class of car.
66 and 1967 B bodies are reasonable enough, all the same underpinnings, Coronets and Belvederes