64-67 Chevelles all have the same wheelbase. The wagons and ElC 's are longer, but it's behind rear wheels. The 2 dr and 4 doors can use same frame, convertible is boxed frame. Wagon's and El C's are same length but El C has boxed section for early rust through! 68 and up have diferent frame and front fender(?) issues and I'll leave that to someone else. The Hollander interchange is useful for figuring this stuff out. Pretty sure there other GM 'A' body cars that can be used as frame donors except for the El Camino of course. I can look it up if someone needs that info.
Pete Geurds Douglassville, PA
