i think i already know the answer...

a guy at work has a holley 850 cfm....he's been told it's an 850 DP race carb....i haven't seen it yet nor does he know off hand what the part # is, but it was on a 355 chevy in a Z-car he bought....he wants/needs a smaller carb, and I have a 600 cfm vacuum secondary holley on my car...i know i could use some extra carb, but maybe his is too much to make a trade not worth it?
the trade would be carb for carb
mine is a 400 with a .509 cam and torker intake, mallory ignition.....
i still think 850 cfm is WAY too much.....

I bet it will be fine. Id snatch it.