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Marcelo:
Since you have the 2.7 CIS (which I assume you have complete from your donor 1974) then you do not have air stacks, and it sounds as if you are saying that you get electrical shorting with the rain. True?
Anyway, there was an upgrade on later model 911SC cars, where the factory suggested that mesh-shielded ignition wires replace the rubber ones. This may be the cause of your shorting out, if you still have the rubber covered ignition wires. Heat can cause them to crack and short out (spark to ground) if there is rain. Also, have you checked your spark plug covers? They may also be old and causing the shorting.
As I had mentioned, later 911 with AC do not have a shield, and water gets in there all the time. In fact, when I show my car (even after tack events), I always "wash" out the engine compartment, and I have never had an problem starting the car again. I would really suspect that you have some dried-out wiring somewhere, and the rain is exacerbating the problem.
Try looking carefully at the wiring and the spark plug caps (at the end of the ignition wires), and see if they are damaged...Andras
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