For results it sems a single walbro or dual SDs will handle up to 200% injectors. After that you need more. A1000, FL, dual walbros. Then you can lok at the use of a hobbs switch and a manual switch to nake some tuned in setuos. Such as you could run dual walbros but have the second one come on at a bost or fuel pressure level. You can run a Fuelab with a sd pump as back up wired thri a relay with a 3 way switch 1 on 2 off, 2 on 1 off, all off. Etc. Many ways you can build a good system with built in redundancy to keep you off the side of the road and with all the flow you need.