Cab to bed alignment issue

[77sierra454]

I have a 77 C25 regular cab, long box pickup.  It looks like it "peaks" in the center where the cab meets the bed.  I have replaced all the cab bushings hoping that would level it out, but it has not.  I measured from the ground to the body line that runs from front to back of the truck and the back of the cab sits about 1/8 to 3/16 higher than at the front of the bed.  Has anyone else dealt with this?  Can I take 1/8 of an inch out of the rear bushing sleeves to get it to sit lower in the back?  Any thoughts?  Thanks

[Captain Swampy]

Install shims under the front clip and front cab mounts. That's assuming the mounts are in good shape and don't need replacing.