Holley vs speed demon

HEY GUYS! So i am aquireing a speed demon 650 vaccum secondary carb and thinking about putting it on my car.. currenty running a holley 650 dp mechanical secondary. my question for you guys is what is the interchange on holley parts to a demon as far as jets gaskets power valves squirters all that stuff? if someone coudl let me know that would be great.. and also whast the deal with demons idle-eze adjustment? does it work? i know it allows you to change idle speeds with out adjusting butterflies witch is probably really good for throttle response and such..any way let me know!! thanks