Flat4

You shouldn't have to do anything with the EGR system - the carb manifold will bolt right on and the EGR tube will screw into the passenger side head the same as the SPFI manifold. You can then hookup (or not if you prefer) the EGR vacuum line to the front of the Weber carb. You will want to use the EGR valve from the SPFI manifold as it does not have the AAV port on the top. Just bolt the SPFI EGR valve on and go.

If you are refering to the ASV system (air suction valves for the cat's on carbed models), then I could see your concern - that system is entirely eliminated with the SPFI long block as the heads do not have the ports for the ASV pipes drilled. You can just toss that stuff in the trash as it is not used at all with a Weber.

GD