Comparing the 'avenger' to the edelbrock? Bear in mind that the 'avenger' is a holley product and they will tell an absolute lie in a heartbeat. For instance, it is in fact a warmed over 600cfm vacuum secondary carb - they were popular with the dumptrucks with the optional governor - the venturii is the same, the blades are the same etcetcetc but they have mysteriously gained another 50cfm - no big deal, edelbrock did the same with thier 'thunder avs' carbs so i personally don't believe a word any of them say.
All carbs are supposed to be 'out of the box and run' and i find the edelbrock does better than holley, the difference is taht while holley can be a performance carb the edelbrock never will be. If i were serious about off-road stuff i'd have fuel injection, nobodies float/needle&seat/fuel level will perform as well as fuel injection.