motorcraft 4300d operation
 

Can anyone explain to me just how a 4300d works, i just bought one and searching the web but have not found any info on how it goes about metering fuel and air to the engine.
I noticed that there are no booster on secondary just a air flapper, i see it has a small power valve can it be blocked and i didn't see any jetting in the secondaryside,and i see it has a accel.pump can it be made to pump more,and are there any parts or mod's to beef up the performance.And is this a 750 cfm or 710 cfm carb.the casting number on the carb. flange is D2ZF-AA.