I was in the same boat as you , I actually put in the DS tubs and then decided I wanted a 345 so I cut the tubs out and made my own, however you can cut the tubs if you haven't installed them yet and add an 1 1/2 of sheetmetal, If you search 345's on 2nd gen camaro on nastyz, you can see pics of a car that someone did that to.
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