Carbed 2056 running on 3 cyl, Help in Northern Virginia Options

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I had a 2056cc built from my short block about ten years ago. The shop that did it specialized in track & street 911s and didn't have much experience with Type IV engines, but I provided a lot of guidance from 914world. It's got twin EMPI 40 IDF carbs.

A few years ago, I started taking the car to a different shop. The owner is the regional PCA expert for the 914.

The first time he did the valve adjustment, he insisted that I don't need Chromoly pushrods, and replaced them with stock pushrods from his inventory. This confused me since a 2056 has different valve geometry from stock and needs cut-to-length rods, but he insisted. This was a few years ago.

About a year ago, he noted that a single cylinder (#3 if I remember correctly) isn't getting fuel at idle, but seems okay under acceleration. It led to a pretty lumpy idle, but was inconsistent. Sometimes it would idle smoothly, other times I'd have to feather the gas pedal to keep it idling smoothly -- or at all.

I went to a local cruise event in May and the car ran beautifully. Idled well, had plenty of power. The next time I drove the car (about a week later), it was clear to me that it was running on 3 cylinders. Sounds bad, low on power. I've avoided driving it since, except once or twice to see if it was a transient issue.

I suspect one of two things:
1. I need a carb rebuild (jets gummed up?)
OR
2. The valves have gotten way out of adjustment, perhaps because of the stock pushrods, causing one cylinder to have no compression

What's my next move here?

Is there anyone local to DC/NOVA who wants to tinker with me? I'm not capable of doing much myself but I'll buy beer for those would can offer help, tools, etc.