The Buick Power Source book is digitized, I have a copy that I found on the 'net a few years ago that is a .pdf and 18.4 Mb. I have a hard copy that I am keeping but if needed I could send you the .pdf.
I also have one of the Jim Ruggles books and it is pretty old tech, (written in 1982 - 1983). In it Jim says to stay away from girdles but there is also some good / interesting reading as well. Again I am keeping this but just trying to let you know it might not be the best to use if you are building an engine. If you are just looking to have some cool Buick reading on the shelf then disregard my post and good luck finding your books.