not a lot of info came out on the COPO 9561 and other HP COPOs but there was some covered in 1969 magazine articles
the Ed Cunneen COPO Connection book came out late 1980s and was/is a good source
Ed was able to find paperwork from Chevy Employees like Vince Piggins and Fran Preve and from some Chevy dealers like Fred Gibb who had bought HP COPO cars
There are service letters and parts lists and letters to the dealers who ordered HP COPOs
In the 1980s, I was reseaching COPO 427 Chevelles at a time when many Chevelle guys were saying the 427 factory Chevelle did not exist. I had found 1969 magazine articles showing factory built 427 Camaros and Chevelles and had some Chevy dealer ads so I knew they did exist but was still hard to convince people back then.
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