Lets talk push button transmissions

I need another car like I need a hole in the head,but there is a little 64 Valiant peeking my interest.
It has a /6 push button trans. I have zero experience with the a push button car. I would be pulling the slant for a SB. I'm cool with a 904 trans.
What are the necessary trans/linkages to do this V8 swap, keeping the push button set up ?