First it was the 80496...
then they added screw-in MAB & IAB w/ the 80496-1...
then (for a while) they added BLP-made fully-tunable billet metering blocks & a billet base plate as the original "Ultra HP" 80676, all while staying w/ the 1.375" venturi x 1.75" throttle config.

The 80805 is the recent aluminum Ultra HP "950" with the 1.60" venturi and all the latest tricks.

Is Andy the only person on Moparts who has even tried one of these things? They were all over the magazines when Holley introduced the aluminum Ultra HP series in late 2011.