Not Ranked
DCOE's are prone to fuel foaming because the hang on the side of the engine. But for all intents they are very similar in function to an IDA, consequently many of the parts interchange.
Do you have rubber isolaters between the carbs and manifold? If not get them. I used 45 DCOE's very successfully on a L-18 Datsun 510 built for autox . It was an 8200 rpm engine withe the biggest cam that Isky had. I think we ran 36 mm chokes an a 145 mains with 180 air correctors. I don't recall the idle circuit but that can be calculated effectively.
I suggest you do NOT drill more holes.
This is on what displacement Z engine, what's been done to it.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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