Slant 6 pushbutton to 3 speed swap

I used a 3-speed because i got a good deal on a 64 4-door 3-speed donor car, and used everything that I could off of that which was quite a bit. I priced out the parts for a 4-speed and it would have been almost twice as much, and me being married to a wonderful wife who does not care much about this particular hobby, I needed to watch my money. And I have had 3 a-bodies with 4-speeds and only 1 other 3-speed before, so I figured that a 3-speed on the floor would be neat. If any of that makes sense.