This is really not in my wheelhouse, but unless the angle is way off, I don’t see why shims wouldn’t work. Alternately, if it’s an aluminum bracket, a good welding/fab shop should be able to make and weld a modification (shims becoming part of the bracket), if that was an economical solution.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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