If your still running lean and have check for all external vacuum leaks such as hoses and carb gasket and actually tried a different carb then it could be your intake manifold gaskets. I wouldn't part it out for sure, I would hate to see such a nice truck be parted out.
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1985 Scottsdale Shortbed 4x4
Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch.
2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.
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