Suck through Weber is a lot more difficult than SU. SU's don't have progression holes. So you can remove the throttle plate and put it 1 meter before the carburetor and it should still be working (if you don't get freezing). Not the case with the Weber. The plate must stay there. A second plate is needed to keep the turbo out of suction. The link of both throttle plates will become critical. You will have to measure the depression difference all the time until you got it spot on. Trying hard not to see deep vacuum between the carburetor and the turbo inlet. A real mechanical seal on the turbo can be easier.
And using one DCOE in front of the turbo will not make tuning easier. The turbo will see both bores at the same time. OK for full power but light load tuning will take a lot of time. A progressive carburetor as the DGAV can be easier. I would prefer SU HIF for a road engine. Specially because the fuel mix is so well.
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