Those old frames were designed to flex, &should hold up well in stock form. In a case like Duallie's truck (with that long stretch), The boxing he did was a very good idea! the center of the frame(under the cab) takes a lot of stress. If you look at the 1 ton frames, they have a taller section height in that area, as compaired to a 1/2 or 3/4 ton. 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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