I have a 1965 barracuda it had a transmission with 2 cables and a floor shifter . I changed the transmission to a newer one , what can i do ?

I never know what someones budget is so you have many choose from as far as aftermarket shifters.
Most range in the $200 to $400 . Last one I did was a TCI in my 63 with a 70 transmission.Cost was around $180 and works well.They as in most all aftermarket shifters are 1 cable operation.