/6 wont start/ run with choke

"New rebuilt" doesn't mean the same thing as "good".
The carburetor came with the vehicle. The owner was a local mopar drag racing hero who had passed away.
He had shelves of blowers and tunnel rams with dual quads, random carbs all over his shop and was notorious for being super fast.
The carb carter carb was in the trunk wrapped in plastic and in a box.
His widow told me it ran but had carburetor issues. I opened up the replacement carb and all the internals appeared brand new. The carb appeared brand new in general, bead blasted, shiny everything.
The problem is, it acts exactly the same with another carb so personally I believe the carb can be mostly excluded as the culprit of the issue.
I need to do a compression test but my compression tester disappeared with a lot of my tools on the move to Idaho.

I’ll check the manifold for cracks or leaks too but those usually run better with the choke on don’t they?

Those two things, that’s where I’ll start. then I’ll check the valve lash, worst case I’ll pull the engine and go through it. With bearings, rings, ect.

I was hoping someone had a simple explanation. I just want to drive anywhere, anytime with no problems and to keep it completely stock.

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