Bought a 3800 with a supercharger from an old guy in Rocklin. He had bought the engine from Parts Planet in 2005 with only 53,000 docuemented miles. It was from a 1999 Buick Riviera. He had planned on putting it in a sand car. Unfortunately his wife died that same year and the engine just sat in his garage until I bought it in 2012. We had a nice talk very interesting guy even worked in the Klondike in Alaska. Well long story short he sold me the engine, computer, little engine dolley he made for $1000. Then he gave me three large service manuals for the engine. I thanked him profusely and promised him I would send him pics of the finished car. Thanks again Don