I already did that, watched a zillion Holley set up videos and went through that dozens of times.
On my last cougar, a 1970, I used an Edelbrock with a small block 302 and had great results. I had to slightly reduced idle speed and increase the accelerator pump stroke, all of 5 to 10 minutes.
While that vehicle proved to be a lost cause, I never had one single problem with the fuel system ever again.
If I warm up the engine and spin in those idle mixture screws, the vehicle idles but can’t accelerate at all unless you floor it and stalls half the time.
The good news is that I got the electric choke installed on the Edelbrock carb.
The choke kit said it wouldn’t work on an AVS2, but by simply drilling out the manual cable hole to 9/64" & bending the choke to shaft linkage rod, the full range of motion can occur. It was part number 1478.
Basically that shaft that doesn’t fit also isn’t needed. I located a circuit under the dash that’ll be perfect for a electric choke.
It turns out I won’t even need to use a relay like I originally planned to do. The voltage is steady and almost exactly 12 volts with the engine running.
Best of all, if I change my mind about the electric choke, I can a quickly pull it off and go with a simple manual choke.
The other factor is that the Holley isn’t necessarily what the serial number says it is. It could even be cannibalized from several different units!!
If I get the Edelbrock to work, I’ll give away the Holley unit simply for the cost of shipping & one lucky person who is a carb guru can figure out what it’s malfunction is.
The AVS2 also has annular boosters & is newer engineering with a throttle response very similar to throttle body injection.
It’s an upgrade even if both actually worked. There are scores of positive reviews of this on a wide variety of V8 engines and very few problems.
I’m going to hook up the Edelbrock carb to a battery charger to fine tune the choke before installing it on the vehicle.
Timing and full range of motion are the name of the game. Spinning the new choke back and forth. gets a beautiful text book result.
Stay tuned. Yes, there will be pictures and video.
Interestingly enough, this fellow had an almost identical problem. He elected to go with the 650 cfm AVS2 instead of the 500cfm one, but the results are dramatic.