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YOU Sir-Are having TOO Much Fun!!Nice Truck, and nice work. I'm going through a 1980 C-10, will post progress.
So on your axle flip, you didn't have to notch the frame. I guess that at some year/point GM changed the clearance? I have a '80 that I'm considering doing that to, but have only seen where they notch the frame.
120K mileage on an LS is actually considered low mileage. You shouldn't have seen much wear.