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I was looking at these gears on ebay and wondering what they are? Are they for use without a timming chain and just gear drive. http://cgi.ebay.com/ebaymotors/Mopar-Cuda-Charger-383-440-Hemi-Pete-Jackson-gear-drive-/150573269458?pt=Vintage_Car_Truck_Parts_Accessories&hash=item230eddc1d2