Rock auto is incorrect. The flexplate center hole changed diameter between 1967 and 1968. The flexplate they have listed Z-196 is for the 1968 up small block. As far as I know the early flexplate is no longer available new. How ever it is possible to make a spacer ring (similar to the crank adapter bushing) to go over the crank flange, and center the flexplate with the larger center hole.
