If you want one that looks similar but is an 800cfm model, you can buy an early 70's 455 Buick carb. Everyday Performance shows several of these Buick carbs.
800 CFM will be '72 and later for the Buick 455 carbs.
Not for argument, but just to try and present correct info: lots of Buick sites say that the '71Buick GS455's had 800cfm Q-jets. On page 9 of his Q-jet book, Cliff Ruggles said the 800cfm Q's were introduced on the '71 Buick models. So, I assume that it is safe to say that some of the Buick 800cfm Q's were made in 1970, for use on 1971 models. If I'm wrong, then I stand corrected.
