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What was Baldwin Chevrolet became Valley Stream Chevrolet soon there after. I don't recall that there was a dealer in between?"

Baldwin Chevrolet was never Valley Stream Chevrolet. Valley Stream Chevrolet still exists it is three towns to the west (in Valley Stream), also on Merrick Road. Baldwin Chev became Williams, (without initials) then Lyons Chevrolet until it closed. It is now a drug store or something. Ironically the neighborhood did not stay forgotten for too long as Joey Buttafucco's First Class Auto Body is just down the block.
Chris