When I inquired about the conversion on my '73 I was told that there were four different pedal configurations used on the Pinto. Obviously the '71-'73 (and apparently some '74's also). I'm not sure how the others were split years wise, but I was told that brake booster models required a different pedal.
So, sorry I don't have a definitive answer, but I'd recommend caution to the things I mentioned.
Tom