4 barrel carb questions

I would like to see if anyone can help out. which I'm sure has been covered before I just cannot seem to find what I'm looking for. I'm thinking about putting a 4 bbl carb on my slat I have an intake and a carter 400 cfm carb. what all is needed to accomplish this mod? I would like to try and get part numbers for cables, brakets, and miscellaneous.
Now for the kicker I'm tinking of doing this on my 62 Valiant wagon with the mechanical linkage throttle.
Thanks for any and all assistance.