Best aftermarket carb for a stock 440?

[Chargeraddict]

Hey Fellas, I have a 68 charger with a 69 440 in it using a carter avs carb...  I cant get it to run right with this crappy old carb. The engine is pretty much stock other than an edelbrock intake, I may do some mild engine work in the future but nothing crazy since I drive this car a lot. Any suggestions what carb I should invest in? And how big, 650, 750 ? Thanks

[Chatt69chgr]

Holley or Quick Fuel Technology.  750 CFM.

[62 Max]

And I'll take your crappy old AVS.