I have a small vac block that is connected to each runner, from there I have a line that goes to a vac storage can it is an overflow tank that seals up that has 2 connections, the other goes to the MAP sensor, it dampens the pulse .smooths out the signal to the MAP, no need for an IAC, going from a Indy single plane & carb to 8stack efi the ONLY change, my converter flash went from about 4200rpm to 5100rpm, smooth idle, much higher vacuum, LOVE IT, just takes some effort to get them dialed in. also NO pcv, just have a catch can breather.