Thanks for the advice Andrew. I´ve just balanced the carbs using a synchrometer and adjust the micture using a colortune, and took it to have an exhaust fumes test. The CO was about 1.96% and the HC 1600, we took some gas out of each carb and got the CO to 3% and the HC to 600. I then figured out with my mechanic that the needle valves of the carbs were worn, and that the fuel pressure was about 7psi. I installed the fuel regulator (factory) and we got it down to 3.5 which is to low for the webers, I took it out and I am running the car as is.
I´ve just ordered the new needle valves, I will change the fuel pump, install the filter/regulator, re-adjust the carbs and see waht happens.
You are right, when I adjusted the carbs, cylinder´s 3 plug was wet, I checked the plugs today after using it a while with the new adjustment, and it was completely dry.