Need a little help with a body lift kit

[bill8333]

Hello. I just bought a 1972 1/2 ton L/B and it has a body lift kit on it. I don't like the way it looks so I'm taking it off. The question I have is the kit included red bushings and a block set up. I took the blocks out and set the cab down on the red bushings. The problem is it looks like the cab is sitting down at the rear or back of the cab. I compared the blocks not the red bushings and found the ones in the rear are 1/2 an inch higher than the others. Can I cut the blocks and use them to level the cab, or does the 1972 cab sit down in the rear. ???

Thanks Up front Bill