My longhorn has a different frame than the other 67-72s......I didnt think it was different in the nose area, but it might be  I do know that the rails are taller starting just ahead of the firewall, & on back. At the trans crossmember, the frame is 8" tall, then tapers to 7" till it kicks up to go over the rear axle, then tapers down to about 5" in height. 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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