the upper arms from the 70 will work, just swap the balljoints. Some of the guys are swapping the complete crossmember, & while I havent done it that way, it is my understanding that drilling ,or egging a couple bolt holes will let it bolt right in. As far as lines/ hoses,master ect.....you can swap them off the later truck with minimual mods. my69 longhorn has been swapped to 1/2 ton pcs, & i used a 75 C10 for donor parts . I have the orig crossmember/upper arms, 71 1/2 ton lower arms, & used the spindles,ball joints, outer tie rod ends, rotors, calipers, lines,hoses, prop valve,& master from the 75....also the 12 bolt rear, with all the brake hardware. If you get the complete parts truck, you will be ahead of the game. Good luck.....crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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