Buy Everything at Once or Piece Together

If I was to convert an auto car to a stick (which I wouldn't do) I'd seriously reconsider using the factory setup. WHen I had my 340 swinger I always had assaches with the factory stuff. The shifter, the zbar, the clutch pedal, etc.

I'd get all the parts you need, then do the install. I would use a new pedal assembly and a hydraulic clutch if it were me.