I need education on the Thermoquad "staged accelerator pump" , that gives an additional shot when the secondaries open

Found the text for adding a vacuum advance port to a TQ without one (ELB and ESA versions)
Adding vacuum advance port to ELB and ESA TQs:

Many Lean Burn carburetors lack a vacuum advance port because advance was controlled by the ELB computer. The port may be added to provide a vacuum advance signal for a conventional non-ELB/ESA distributor system. The vacuum advance port is somewhat tricky and is best performed by comparison to an earlier throttle base that has the factory port. Using ~5/32" drill bit, drill the throttle base where the vacuum port existed on previous units....drill into the open (roughly square) opening between the outside and the throttle bore. This will accommodate the vacuum fitting. Then, using ~1/16" drill bit, drill two holes just above the throttle plate into the same square opening from the throttle bore side one hole adjacent to the other parallel to the throttle plate. Then, using a knife or small screwdriver, blend the holes together into a slot. This serves as the off-idle transfer slot to feed the vacuum port. Press a short length of 5/32" pipe or an old fitting into the outside hole. Vacuum advance is now available. Using another base with the port as a guide will ensure proper placement of the transfer slot. Misplacing the vacuum idle transfer slot can cause an off-idle stumble and will necessitate additional tuning or replacement.
Credit: A Carto TQ Guide by Gary Lewallen
https://carbkitsource.com/tech/Carter/pages/tqguide-Vaanth.html