You really need to see the fuel pressure from the car.It is paramount to understanding issues like, is it the pickup running dry in the corner, or a carb problem that is causing this stumble?? If you have pressure, you know it's not the pick up.
there are two options: Get a very accurate gauge, or get a super accurate gauge and a cheap gauge. Use the lab quality super accurate one to set up the regulator, then pack it away so vibration doesn't damage it. it goes on a T underhood, and day to day monitoring is done via a normal gauge ont the dash. Paul Yaw used to sell the right one on his website:Yawpower. He's gotten out of the 1st gen business, but you might find a treasure trove of info there, and the type and model gauge he recommends.
1st gen carbs are very sensitive to proper presssure.
Or get a good one and adjust with that. I had a good one, then got the lab version, and I was lucky, my gauge is very accurate.
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