I wonder which engine Feastesss was referring to.
Speaking for the 396 that used an early Q-jet, the single rod was used with the throttle style your Holley has whereby the large hole with the grommet and insert and cotter pin was used. Afterwards, the 2nd design rod went into a smaller hole (like in your picture) without any grommet/bushing and was held in with a E-ring. I thought the 2-piece design was at first unique to the 396/375 and then later used on the 396 w/Q-jet. Does your Green Machine have a 2-piece or 1-piece? Not living outside my '67 world I guess '68 was different?
Mike