Chaplin,
I've got a 650 speed demon on my 351W. I've been on the road for over three years and I really think it is a good carb. I have mechanical secondaries, not vacuum, and no choke. The car runs fine and I have no complaints. They have good tech support also and they helped me to maximize the carb when I was doing the dyno thing last year.
If I was going to do alot of racing I would consider either an upgraded BG or AED or DaVinci. Holley, to me, is just a standard unworked carb.
http://www.aedperformance.com/
http://www.davincicarb.com/index1.htm
Roscoe