help transmission

i am using a 904 transmission from a 78 cordoba in my 65 barracuda and i need advice for what parts i need to use my og shifter handle to use on the cordoba 904 cuz shift cables wont wok on it

You are correct that your dual cable floor shifter won’t work. Imperial Services used to make a conversion kit to use one of their cables along with a spring change in the valve body to use the 65 shifter with a 66-later transmission; however, I think they are basically out of business. An aftermarket floor shifter will now be your best option.