Small block Z-Bar differences?

[694spd]

Were the SB Z-bars different in 1970 and later then the pre 1970 ones? I see that
Year One lists a 63-69 part and a 1970-76 one. Did the length or the arms change?

 

[abdywgn]

Were the SB Z-bars different in 1970 and later then the pre 1970 ones? I see that
Year One lists a 63-69 part and a 1970-76 one. Did the length or the arms change?

63-66 would be different than the later 67 and up A-body. I believe that any 67 and up z-bar would interchange. The one I remember reading about being different but have never seen one is a 70 version that had an actual bearing in it and not the nylon bushings.