Hitman is mistaken this time. There's no such thing as a 650 cfm q-jet. Only the 750 and 800 models. The engine may not use all of it, but that's the cfm they're capable of, so that's what the castings are called. You can find more info about q-jets with a google search if you like.
As for a cheap 800....if you know where there's a Pull-a-Part yard with 76-79 GM cars in it, you can get one cheap. Look for Buick, Olds, Pontiacs, since they have the gas inlet in front, which is what you need. Chevys normally have the gas inlet coming in on the passenger side. I've gotten a couple of them off of 76 Grand Prixs for example. You might have to do some accelerator linkage swapping or modding. Of course, you'll probably have to rebuild it too, unless you get lucky and find a fresh one.
Or just buy a rebuilt one from the parts store
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