a:

The Webers will require a fuel supply regulated to ~3-5psi. Just upstream (pump side) of the pressure regulator a tee can be installed in the feed line from the pump with a return orifice of 1.2-1.5mm, and then be connected to the existing return line to the tank. This configuration replicates the single package regulator/return connection that was used with some carbureted M110s from 1976 onward, most notably in Sweden.