The only problem you may encounter is if your heads do not have the end bolt holes for the exhaust. 1972 heads have the end holes missing and no room to drill and tap, some heads have the end holes missing but the boss is there so one could drill and tap the holes for headers. Most Pontiac heads will accept headers without any problems.
Some headers are automatic or manual specific as well as power steering or not. You'll find some that fit the engine and year of car, no problem.