Personally, I don’t believe there was ever any proposal to build a 4-door E-body. If you look at John Herlitz’s clay models during 1967 & 1968, he was designing a 2-door from the start. By December of 1967, the clay model was close to the final design: https://www.johnherlitz.org/e-body_barracuda.html
the last pictures appear to be actual cars. Curious if those cars exist or were crushed? Anyone know?
