The progressive twin barrel correctly jetted with manifold is around £700 plus vat so not cheap but other than re fitting the existing air filter is plug and play
I have run cars with Webber DCOE for over 30 years and a car with twin SU for two years and my own personal experience is the SU is much more finicky to get just right
Seems like the requirement is to stay as close to original as possible so a single barrel carb is what’s required here
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