For all intents and purposes YOU are the expert when it comes to early fullsize size 4 speed cars so your thoughts and insight on this subject always facinate me. Thanks for adding. My comments were, as some of my comments are, based on my vast GENERAL knowledge of everything old car and sometimes historically to understand an issue I try to look at the big picture. Your comments clearly indicate that although rare, early 4 speed cars were considered production. I figured they were production of course, built on the line but also thought that maybe Buick discouraged their production for obvious reasons. As you point out, Buick was not in the factory speed support group.
I am familiar with Pontiacs, Chevy and others efforts so I understand that difference. I was wondering where you were going with the silver engine paint.
Dave and others - what if (here I go again) the owner 'blew' up the original motor shortly after ownership, maybe even under warranty and it was replaced with a 425, same year but came in Buick Green instead of silver? Oh who knows, as Matt said, it's a 425 4 speed car, so it's cool.