I had a Edelbrock performer 800 CFM carburetor on my 426 Wedge , direct connection heads , Mopar purple cam , Edelbrock torqer with an open plenum and the carb did not work very good , a lot of times when I came to a stop the engine stalled , I put a Holley 800 DP and worked fine , no stalling , I heard with a open plenum the Edelbrock carb does not work good at least that was my problem.