How bad are the holes? If you can avoid removing the pan, that's the best fix. Just try patching the area if it's weak. Removing floor pans will affect the strength of the car so it needs to be put up properly and a lot of time guys will weld in reinforcing bars to help hold the body from flexing.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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