the firewall is the same on the cabs, just the eng positioning is different for the BB 2wd trucks. 4 wd sb sits in I 6 position(for 2 wd), the factory sb (2 wd sits about 3 1/2" farther ahead than the I 6, 2 wd , or sb 4wd. the BB comes somewhere tween those two spots on the 2 wd truck. 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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