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911 1969 Trying to track down a fuel? gremlin

Engine

Vehicle Information: Model: 911T; Year: 1969; Body Type: Coupe; Engine (type, size, modifications): 2.2, unknown; Total Mileage: 68,000;

About a month ago I purchased a 1969 911T. This motor has been running EXTREMELY rich, it stunk of gas while running, and fouled the plugs in about 300 miles. I just took it down for a full tune up and found some interesting things: 1.) the CD ignition system has been removed, replaced by a plain old Bosch blue coil, condenser, and fully mechanical Bosch distributor. 2.) All the valves were tight. 3.) there is evidence of a vacuum leak on #1 intake manifold. 4.) Somehow this car got Weber 40 IDA 's on it. 5.) someone put in a 1970 2.2L motor.I went through the full tune up proceedure, including valves, timing, dwell, carb synchronizing and idle mixture adjustment. It still runs bad.Could it be that the carbs are jetted for the hotter spark of the CD system, or that they aren't even for the right motor? What effect does the idle mixture screw have vs. the idle jet? How do I intellegently approach this problem?

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