Back in the day when there was a lot of these swaps going on Holley made an extension piece for the linkeage, it was a female/male rod that screwed on to the existing rod and allowed another 1 inch or so of adjustment.
You can also cut and lengthen your existing rod, it is case hardened so you may need a cut off wheel to cut it.
Also as you have found the cable is too short. Mopar still sells them.