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As a 49 year member in PCA, I have seen many guys put carbs on a 911, from factory Webbers, PMS or a 4 barrel. Not a single one drove for beans. Carbs work OK at wide open throttle. That is about it.
In corners (was al love corners) they exhibit fuel starvation, the run really bad at idle, and even worse when the temps are cold. Long ago I did the opposite for my El Camino, I happily disposed of my factory carburetor, and put on fuel injection from a home made setup using throttle body components from 90s C10 pickup. It runs like a modern car, in zero degree or 100+ it starts instantly, and never hesitates.
The biggest reason that pushed me to go to fuel injection was sitting in a freezing cold car waiting for it to warm up enough to idle at all. That and trying to pull out onto a road with traffic. Hit the gas and it just coughed, and sputtered before it ever got moving slowly.
Just find a competent mechanic for the CIS. When working right, it is a good system. Most issues are vacuum leaks.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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