gmc year id help

[wibilly]

a girlfriend of mine sent me some pics of a friends gmc today. it needs a cam. he was going to replace whole engine with one from another truck he had bought for that purpose.he is now thinking he may never get to it. of course i want it. i 'm looking for help in determining the year. i'v narowed it down to 69-71 by foot operated parking break and door panels not being of a 72. so i guess the grill would be next i'm not familiar with them on the gmc.and at this time don't know if it has disc breaks and have no pics of tailgate.grill has black trim and parking lights and turn signals directly beneith the headlights can any one help id this. it has ps pb ac duel sadel tanksand looks pretty nice in pics thanks