I would also try the Demon first, your combo seems pretty stout and I wouldn't be surprised if your Edelbrock and/or Thermoquad need some mods to work. Usually fuel delivery problems show up at the big end, there should be enough reserve fuel in the bowls to handle the launch.
But yes your fuel system can only flow as much as the smallest part and it sounds like you have different sizes throughout; it should all be the same size at least 3/8" all the way.
The above statement has issues. The combo is not a crazy one. The stock carbs do have there limitations, but your not there yet as to "Require" mods.
The AFB or the TQ can handle the combo. Without mods. But the AFB does have an issue with the secondary door not being adjustable or difficult to adjust since it will tKe a lot of trial and error to fix. The weighted air doors are not obtainable.
You do make sense by short sold the Carter carbs unfairly. Lack of fuel on the big end is normally seen as a miss.
The probable issue is uncovering the primary jets on launch.
I would replace the whole fuel line with at least 1/2 inch or bigger right out of the cell. but sounds like you are sloshing the fuel bowls I had this happen to me in my old duster I had to put tubes in the fuel bowls slosh tubes
The probable "BINGO" IMO right here. There's a little problem to do this on a Carter design.
u do not need a hood scoop, #4 is way small-should be 6 or 8 or 3/8", it is not fuel sloshing - I drop the clutch at 5000 with slicks with an AVS and run 11.7 with no scoop, super stock 340 cars run 10s with AVS and thermoquads and no scoop
If it is not the fuel sloshing, then it's starving for fuel. The flip to the above possible. But your example is excellent. The carbs can run.
Some info on your suspension setup might be very helpful with figuring out your launch issues.You will have to spent plenty of T&T to finally get it right,at least it did for me when I was racing my 4 speed car.I gave up and built my 66 Dart with auto,which is much easier on parts and the car.
This is also a real big issue on launching a car. It does effect everything.
My suggestion for the Carter carb use is;
1; Shelve the AFB. The non adjustable air door will cause more problems than it's worth. When they slam open at a bad time in the engines rpm and cars actual need for the secondary to be open are the biggest offenders to the problem coupled with the issue of the carb NOT having a secondary pump shot ability.
To use the AFB effectively right now would require you to "Walk" it (the car) out off the line and slowly step into the throttle as quick as the car can handle it.
2; raise the float level of ether of the Carter carbs. Yes this enriches the mix and further tuning will be required. Tighten up the TQ's air door so it doesn't tip in to early.
3; Yes! Do try the Demon carb. Use jet extensions as needed.
4; all fuel lines to 3/8th's. For strip purposes, I like an electric pump.
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