Timing Dance ! Vacume Advance ?

Like Fishy said... you can change the fuel curve on an Edelbrock by changing the rod to get more or less fuel in on each step of the rod. This is one of those areas where Holley simply isnt as flexible or as good IMO... The old Carter AVS rods had 3 steps... Edelbrock AVSs have two. The lower end of the rod is the power step, the upper section the cruise step. By matching the jet and rod combo you should have no trouble tuning the primaries. The vacuum level will tell you which step up spring you need. Simply going with the heaviest spring can also hurt you. Read the tuning manual and it has the idle vacuum amounts and corresponding spring. On top of the primaries is the choke plate... Which you say you dont need and wire open/remove parts. The secondary has jets only (no metering rods) because the air door controls the part throttle airflow and therefore the fuel flow. The air door is NOT a choke. It's to allow the air speed in the secondaries to increase in a steady manner so you don't have bogs. Liek was said.. more preload (tighter spring tension holding it closed) is better than too little as it will bog and there's nothing you can do about it until the air speed picks up with rpm.