The upper balljoints will bolt into the existing arms, but the lower arms will need to be swapped due to the sizing of the hole for the balljoint. As far as drop with bags, i cant help much, but my guess would be around 3" additional drop @ ride height? best of 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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