My "Boss 372" (stroked clevor) is running a Demon RS set up for 1050 cfm at the moment and is in my 3200# Boss 302 body and runs fine. Now I haven't had it on a dyno but when that thing opens up there is no delay in throttle response. If dumped in 1st or 2nd it just lights the tires. These carbs are set up to have their flow rates changed for varying applications. I probably will try other sleeve sets for it to try it at other CFM ratings but for now it's fine. BTW, I picked mine up on ebay for less than $500. I second the advise to make a call to:
http://www.4secondsflat.com/ I bought their tuner manual and there is a huge amount of info there.
Steve