I used imperial's cables when I put a newer 727 in my '65 belvedere II. It's a good kit, not too miserable to install and adjust. But it took over 6 months for them to send it to me. The main reason I did the trans swap was to run a newer style valve body, IMO that was the only bonus.

In order to know what you want, you'll probably have to find out what you don't want.