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I want to put a 3.8L supercharged bonneville motor in a '77 firebibird. I need info on bolt patterns, adapter plates and where to buy them, and more specifically the flex plate.
 

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GM has two versions of the 3800, a FWD bellhousing bolt pattern and a RWD bolt pattern. The FWD bolt pattern 3800 was actually used in RWD fourth-gen F-body cars. You can get a RWD 4L60E that bolts to the 3800, no adapters needed.
 
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