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The sway bar design changed from '69 to '70 and so did the K-member. I'm not sure if they made a change to the LCA's for that or not. The uppers are probably the same right from '66 to '70.
You could actually use the earlier B-body stuff if you don't care about originality - the sway bar will be different. No difference performance-wise, just different.
Upper control arms are the same from 66-72, lowers are 70-72 B body and E body. 70 B-body k-frames will fit but the steering angle is off a bit. 71-72 B-body k-frame is the same as E-body.