That's not a '68 Cutlass, that's a '69. The green car is a 70s Lincoln. The white 4 door looks like a '73-'74 Nova. The red car is a 1967-68 Plymouth Fury. And the green car is a '73 LeMans.
True story. My uncle had one of these that sat behind the barn for a long time. He had a gravel business and one day dug a hole and buried the car on its side half way up. It was our submarine/play house to years. We spent endless hours in that old (sub).