I dont have EFI (yet) but adding Weaind 177 blowers so I want to know A/F ratio. Had some aluminum wedges made so I can put O2 sensors between Gil exhaust manifolds and pipes. I run closed cooling and water dumps back into exhaust pipes 4 feet away from motors and down angle. I'll let you know if they live or not in a month.

Weiand 177's.Destroyed a couple of motors with those when I was young.
EFI and O2's will be your best friend because boost isn't.