Hi guys, I own a 1969 Buick GS 400 with a 430 engine in it. I believe it is a Riviera's, but I'm not sure. The engine was honed some years ago to a 438 CUI and is completely stock. Currently I'm restoring my car and I also want to do some minor things to my engine. I've purchased an HEI ignition and I want to replace my carb. Currently there is a 4160 600 CFM Holley installed, but I understand a Rochester quadrajet is the stock carburator. And from what I understand from this forum is that it is good carb. But I have a few questions. -First off, I see a Riviera carb (7029241) and a non-Riviera carb (7029240). What is the difference? Does it apply for me? -If I'm correct, this carb is a 750 CFM one. Even though it is stock, isn't that too big? When I use a CFM calculator 600 CFM, what I have now, sounds about right. (5500 rpm) - Is it really a good carb?