Hi Phil. I have seen a bolt-in motor mount conversion bracket kit that allows retrofitting Chevrolet V8s into BOP-powered cars advertised in the Original Parts Group catalogues for BOP A-bodies. It carries a part number of G221427 and costs $69.95 according to my 2009 catalogue.
Once you get past the exterior sheet metal, you are dealing with a GM A-body.
Some obstacles you will have to contend with is the following: The fuel line runs along the driver's side on a Buick and on the passenger side on a Chevrolet. Your transmission bolt pattern is different on a Chevrolet than on BOP V8s. You won't be able to use your Buick automatic transmission. You will need accessory brackets, exhaust-related pieces, and radiator-related parts for a Chevrolet V8. You might also have to alter your engine wiring harness somewhat since the Chevrolet engine places the distributor at the rear and your old Buick 350 has it up front.
Good luck with your project.
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