The track width should be the same,as the arms are the same lenght, but have different steer stops welded on.I havent run into the steer stop issue myself(I have 71 lower arms, & 75 spindles on my longhorn). I have caught a couple posts from the guys that had steer stop issues, & Im not sure how much reduction in steer radius there was, but the fix was to grind the stops on the spindles(the truck was already assembled). 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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