After doing more reading it seems that any single groove big block pulley is the same for the 66-68 Hemi also. I have plenty of those laying around and will give it a shot.
Link please because that can't be right , the hub is also thicker on an ORIGINAL Hemi balancer. , if one runs a thin balancer on the Hemi then stock B/RB wedge pullys can be used , this not the case with the Hemi.
