I have ZR1 replicas 17x11 with 50mm offset and V710's 's and run a 0.400 billet aluminum spacer (all four corners) for autox and don't have any issues at all with the bumpstop (or the outer fender lip for that matter). Without the spacer, I could see the bump stop becoming a problem when jacking the car up and the suspension going to full extension. I did have to take the BFH to the front of the rear inner wheel well to massage the wheel house some ,but no big deal.
Keep in mind that there are two offsets the ZR1 wheels come in, 50mm and 36mm. Supposedly, the 50mm is better suited to the Camaro and the 36mm is better suited to the TransAm/Firebird. Lots of info on this is on FFRAX.
Good Luck.
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1999 Formula 6spd (The driver)
1997 2500 Ext. Cab Dodge 4x4 CTD 5spd (The Earth Mover)
1970 Nova 5spd (The toy)
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