3.29 is what your car has. 3.05 is what the 3100 cars typically got.
You can look at the RPO code on your trunk tag for FR9 (3.29), 1LDB on trans tag... F83 (3.05), 1LBB on tag... There's a handful of other varieties, but those are the two I see for 3800 Chevy's in 2001.
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