[Daves911L]

Probably no great advantage in switching a good running original CIS system to carbs.

Mechanical factors in your engine (camshaft/compression ratio) will limit performance gains to useful, but relatively modest increases. You can (assuming you like to tinker and tune) change the drive-ability/throttle response somewhat for the better. Or you can make it worse.

You will give up some convenience, like turning the key and having the car just start and idle. Your neighbors will appreciate the pops and chirps as you blip the throttle of your carbed 911 for several minutes early on Sunday mornings! And on hot afternoons you will crank on it for ages getting the boiled-off fuel out of the way and filling the bowls with fresh. Oh, and your garage will smell like gasoline all the time

You will gain simplicity with a nice, open engine bay where everthing can be easily reached. You will get a few pounds of weight savings where it counts (high and in the back!). There will be less things to troubleshoot when there is a problem. But the carbs may be less consistent (stuff always seems to get into jets, no matter how many filters are in the way).

You will gain wonderful intake sound. And you will gain terrible intake noise. The first time you run those carbs to redline in 3rd gear it will be the sexiest thing you have ever heard. The 15th time you come in after a 3 hour run home on the Interstate in bumper to bumper traffic and your ears are ringing.......well, you get the idea.

Water will get in your engine with carbs. It shouldn't, but it does. Even with the little water shields, sooner or later the car will sit out out in the rain and a drip will find exactly the worst spot. School of hard knocks speaking here! With CIS and that labrythine intake path, you'd have to drive it into the lake to get water. Oh, and related to the short vertical path that makes that glorious roar, throttle response, etc....you must learn to fish. Any time you happen to have a tiny nut slip through your fingers, it will always happen when you have just removed the air filter for a moment. If you drop that tiny nut on the other side of your shop, 30 feet away, and your air filters are off it will bounce 3 times and go straight down the intake. Never fails!

You will lose originality, should you decide to part with your car some day. Depending on where you live, you may lose your ability to meet emission tests. Usually a way around this, but it can be a headache.

Nothing wrong with carbs. They can and do work quite well. But really can't see exchanging a working injection system for them, assuming that's the only modification you intend. Thats my opinion, anyway.