Hi guys Ray from Alberta Canada. I'm still very new to the V8buick site. I'm still working on my Car LOL and will be for awhile as you guys know any 73-75 parts are getting or are hard to find. Information is even harder. Thanks to Eric B and his hard work and research more info is now out there. I don't have a GS however on Eric's post he said he found that 99 Century's were built with the 455. My question is. Did that number include my 73 luxus U code car Mine also has factory AC (or did when built). Or is he only talking about the GS.