Brown's Man, these things are ugly. It has a Centurion badge on the liftgate, but it's in the '92-96 font, so I don't think it's a real Centurion conversion.
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The frame isn't what keeps the truck straight. Watch this video:

So modifying the frame won't fix it, but it could create many new problems.

These 2 albums show what you SHOULD do to it:

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If the sheet metal is torn or significantly bent, don't waste your time.