I’m guessing you also had the dual cable transmission shift linkage previously. If you end up with a 66+ trans, you’ll have to update your shifter too. Mine was a column shift so I eventually being looking for 66 column or maybe go with a universal aftermarket.
I don't have that setup anymore, I was going to just put one of those b&m shifters and cables in, tbh I hate the early duel cable ball\trunnion stuff its just straight junk in my opinion..