Metering Block or Plate?

I purchased a used Holley 3310-2 which has a secondary metering plate, a.k.a. a 4160 carb. Holley makes kits to change the 4160 to a 4150 carb. What are the advantages to switching out the metering plate for a metering block, if any, other than ease of changing jets? The carb needs a complete rebuild so I'm weighing my options at this point.

Note: I will most likely use this carb on my current 350 and swap it to a 454 once I get one.

I've tried to search this extensively online but the only thing I can find is people comparing hole sizes in the plates to jets.

Just added tuning ability.

Agreed. Easier to tune. That's why the Quickfuel carbs are so nice. Most of them come with really cool tuning features like externally adjustable floats with windows. Externally adjustable secondary springs. Screw-in air bleeds, etc.

All these things are available to upgrade your average Holley to but its a lot more work and probably as much money to do those upgrades than just buying a new QF that already has them.

My brother has an 850 QF on a Plymouth satellite, (492 cI) and it is the first one I have messed with. It is very tune able almost fuel injection, much more than the old hollies. My Bro actually started with the Q series drag race one with no choke provision, not so good on the street especially in cold weather. The QF SS has an electric choke and now the car starts and runs without out having to pump the pedal to keep it going. To really tune it to the inth, probably need a wide band O2 and fuel air ratio gauge, still read all the instructions and do what they say and use a vacuum gauge, (what I did,) and you will love it. I am a big Holly fan and most of the jets and etc I have is specific to them, and they have basically the same thing in there HP series.

• Contoured venturi inlet offers balanced airflow for increased horsepower.

• Screw in air bleeds for precision tuning capabilities.

• Four corner idle for precise idle control.

• Mechanical secondaries for awesome tire turning performance.

• Dual accelerator pumps for additional fuel under initial acceleration.

• Dual feed fuel inlets for constant high volume fuel delivery.

• Available in 650, 750, 850, and 950 CFM versions. Holly site for this. The vacuum secondaries are very tuneable with springs etc, prefer then to the mechanical for mostly street driving. Have fun!