Sounds neat! First thing to do is get in a Buick Car Club. That pup is a little old for me - the only one I know of is a few years newer with the straight eight. Did plugs on it and found I had to find a 7/8th extra deep socket for those.
This thing may be valuable. The clubs will be a great resource for this. Good luck with it,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/