Pinto 5.0 is correct. There are (I was told) four different pedal combinations used in the Pinto. 71-73, 74+ manual and power brakes and I don't know the fourth??? Maybe some year change between 74-80? So, make sure you get the correct set.
You might look into a T-5, five speed as they may actually be more prevalent and cost nearly the same. That is if you have 3.40 or 3.55 gears. Otherwise, I'm thinking the gearing won't be beneficial. Reversing the trans mount (and slotting the holes with a file) and cutting the shifter opening forward about 2"-3" is about the only difference from what you need for the 4 speed.
Shifter boot is needed.
No, wagon driveshaft is the same sedan or wagon. However, the trans/rearend combinations may have different lengths. My '73 wagon C-4 / 6-3/4" rear driveshaft worked perfectly with my T-5 / 8" rear.
T-5 I had issues with the cable end speedometer gear. It hit the back of the housing, bound and caused the output shaft gear to move backwards. Grinding the tip of the cable gear fixed the problem.