69's have a large support bracket welded to the front of the two spring pockets for the lower control arm bumper. 67s and 68s don't have this feature. Not a big deal if you keep the same year control arms with the same year frame. Theres pictures in another thread of this support.
There are some differences in appearance, like the A- arm bumpers on a 67 are mounted on the frame, whereas a 68 and 69 they are mounted on the lower control arm. Some of the bracing on the frame is also different. Also, I believe a 69 frame has some extra holes where the radiator would mount. In appearance the frames are different, but a 68 and a 69 frame would work on a 67. Also kept in mind that there were two different versions of 67 frames. The early versions didn't have the holes cut out where the front bumper brackets mount. Where as the later version had the holes like a 68 and 69 frames.
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