Finetuning questions - do I need a high-stall torque converter ?

What elevation are you at?
What is your exact compression ratio?
At what rpms were your peak torque and hp numbers recorded?
Is your carb getting fresh cold air?
Are you running an exhaust crossover?

That combo, with those tires, at sealevel, and fresh air, should be a tire fryer, just as it is. The AVS, having an AirValveSecondary, depending on the spring tension, the compression ratio,and your elevation, could be/probably is, the issue.
The 3.23s and 2200 TC aren't helping your ET, but at 14.1 seconds, that should put you at just over 100mph, which is pretty fine for your combo!
If it was mine, I'd be opening the secondaries earlier, or throwing a DP carb on it. Then maybe a lil more gear,and last on my list would be a higher stall TC. Then again, in a country with a no-speed-limit hiway, maybe the TC could be second, and the gears last.
Save your brakes,install a line-loc.