Not Ranked
Some of the High Performance 850-950 Holley style carbs have NO vacuum fittings.
I suspect the shop that worked on it may have changed some carb settings or jets/bleeds.
If the timing is right - roughly 16 degrees at idle and 34-36 degrees at 3000 RPMs, I would bet for lean condition.
I would go thru the Holley dial in procedure step by step.
John
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