The 1406 is too small to make a 3.23 SG 2800 convert to catch low 13s in the 1/4, even hard at sea level on a wicked tune. They are not a 650cfm carb. Some of the AVS are, vary between 625 and 650, depending on which one you've got.
They do make a bigger AFB, but on this run, if you don't mind monkeying, a TQ would be boss. You can get primaries and new plastic bodies for them, if need be.
If not, Skrews suggestion would be a great choice.
The Street Demon is wet CFM tested at 625. I don't know if Holley is producing dry or wet CFM numbers on their carbs, but on their Demon units, they are. The AFB is dry CFM rated, which is going to drop a bit once fluid is introduced to correct it.
A 1406 wet/ corrected CFM rating is down in the mid 500s. That's a 60 year old design and the CFM testing is rated with air, only, old numbers.
Yep will do..when proper jetting and tuning apparently will do good!
For a 13 second engine, you want 700cfm rated dry, or better if you can find a carb that is designed and rated with wet cfm.
Give that 4150 a go.
