10-30 series are the same(1/2 ton thru 1 ton), assming they are the proper set of yrs. On the chev, 67 & 68 will interchange, but the 67 has no sidemarkers. 69-72 will all interchange.....th onl difference on them is the grill on the truck. I havent been into the GMC's, so I cant help with that. 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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