You can map for a more lively engine on a weber if you can use it. Just tell it when to spark and when to add fuel.
The YB is not a modern engine by any means, most newer cars have to have more capabilities due to the hardware they run, but bolting a new manifold and turbo onto a YB doesn't make it modern, it came out of the ark. I mean its waste gates are normally closed, and it injector into the inlet, show me a modern performance car that does that.
Most modern Turbo cars cruise with the waste gates open to improve economy, engine efficiency goes through the roof with the gates open and fuel economy increases massively, my little 135I will do near on 40 mpg, with an extra litre of engine size and an extra turbo. And it puts the fuel where you want it, the engine, All with almost Zero emissions.
The YB is a very dirty inefficient engine in modern terms, which is why they stopped making it.