yes, those old frame do flex a bunch! For my app & usage I dont think I will be bumping parts, but the longhorns do have a fairly stiff frame compaired to the other pickups. Off road, or heavily loaded might be an issue with the urathane. 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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