383 Wont Idle with new to me 800cfm DP. Idles and runs ok with Edelbrock/AFB

IT should be a debate eddy, carter vs holley on your combo. you say the eddy had no drivability issues. I say bull. I have ran pretty much the same combo as yours starting in the late 70's up until a few years ago. upgraded to 451.
my experience tells me with the purple 292, unless you have a lose convertor and at least 410 gears it is a slug when you mash the throttle . The 850 dp gives the combo the added pump shot it needs to get moving.
my combo with ported 915's 2.14 intake 1.74 exhaust, 557 purple, street dominator with 750dp. 4500 stall and 4.56 gears would et 11.30's at a buck 20 consistently in my daily driver 67 fastback.
I never got out of the 12's with a carter and 292 purple.
stick with holley, it took me over 20 years to figure that out. I was a diehard carter fan.
I meant MY Eddy on this engine has no drivability problems. It starts on first crank. Has a nice lope from the cam. No hesitation weather I stand on the gas or slowly apply throttle. Runs smooth up until I shift gears. I was not saying all The Eddys have no drivability problems. I also was not talking about weather the car might be able to pick up a tenth on its 60 foot time. So yes on my car it has no drivability issues. Oh and as mentioned earlier, I do have a loose converter and 3.90 gears. I only planned on the larger carburetor because my combination is giving up a ton of potential power because of the small carb. I am not to the drivability part yet. Just trying to get it to idle and control the mixture with the mixture screws.