For a 1970, going on a 455. If a 71 will fit too, I'd go for one of those... not looking to be 100% faithful for all-1970 parts if it means tracking down a good ram air cleaner that'll for for my project car. Thanks.
I just finished reconditioning this one and it's for sale http://v8buick.com/index.php?threads/1970-1971-gs-ram-air-cleaner-restored-for-sale.340672/
I've got an extra one that's already been blasted if you just need the air cleaner base without the plastic snorkel.