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.