hope this works, I just got the air gap and 770 street avenger carb combo for my 408 stroker. my engine builder seems to think it will dyno great when we get that far in a month or so. sounds like your combo you are thinking about.
I should have mentioned, 408 stroker is going in a 71 dart. Not a "b" body like my user name implies. I just liked the superbee hemi cars. And it is a rare car now days.