How much CFM for a 360?
The 725 Road Demon I mentioned earlier was a nice looking carb and had some decent features an equivalent holley doesn't BUT. I had all kinds of trouble getting the engine to run smooth below 2000 rpm, spent the entire summer dicking with it. My biggest disapointment was in dealing with Barry Grant, their tech support stinks and when I decided what I really needed was a 650 Speed Demon (the 725 Road Demon is a 750 Speed Demon with a choke kit and slightly differnent jeting) and the only difference was the venturi size in the main body and the main jets I figured I would just buy a main body. BG refused to sell me a main body uder any secumstances. Just becuase of the poor customer service I can't recomend them any more.
Big difference between the Speed Demon 650 and 670 Street Avenger is price. The Speed Demons cost more and don't come with a choke or fuel line kit. The choke is an extra cost option. The Street Avenger comes complete including a fuel line kit and several secondary springs.