Bolt on swaps from different Pinto~s vary some. I have put the 79-80 square front end and bumpers on a 78. If you swap bumpers, you have to take the strut cylinders too, as the 78 bumpers sit lower than the 79 and the bolt pattern is different. 77-78 had aluminum bumpers that look like 74-76, except no bolt heads. 74-76 bumpers are steel. 71-73 has a narrow 'blade' bumper I don't know how you would mount to a later car. 74-78 fenders are interchangeabl e. 71-73 headlight rings are different from 74-75, but they will interchange (by changing mounting hardware) 71-73 cars have different hood mechanisms because they didn't have inside hood release. I put a 78 hood on a 72, but I used hood pins because the latches didn't line up and the radiator support was different. Wagon doors are different than fastback doors (roofline issues). The dash pad, and instrument cluster were different for 79-80. 77-78 has it's own 'raked' front end with soft angled fender extensions and a slanted grille, as opposed to the earlier style. The fender extension on this year also incorporated the turnsignals. The extension divided the signal in half vertically. Earlier front spoilers and valance panels may not work on your late model. I'd recommend looking at 'newer' parts cars, 74-80, like turbo74pinto said, as a lot of these are interchangeabl e, with few exceptions like front seatbelts and carburetors.
Hope that helps some, and :welcome: to the group!
Chuck