priobe why???? To switch to an FI system will set you back about $7,500.00. I love FI systems and will put the 58mm TWM setup on my 498 motor this year if everything works out ok. You know you will need to change your fuel system, add a bigger fuel pump, larger supply line and possible return line. The programming of the system once installed is about $150.00 per hour with about 2-4 hours to get all the modes setup. You will need to find a dry place for the ECU. Some are not water proof. If you are caught in the rain, you may be sitting under that bridge along time.
If you are having problem with the webers, there are a couple of guys here running them and can get your car running better. An LM-1 o2 sensor would go along way to help in tuning your car. It reads the air/fuel mixture when the car is running at all rpms and loads. You will need airfilters also for the throttlebodies. Depending on your car and how low the motor is in the chassic, this could be a problem also. Some systems have no idle control on them. There alot more info than just this. My fingers are tired. Rick L.