Since its a 'draw through' AFM, its just seeing the suck side of the turbo.
I added a small turbo to a L28, only tuning was a rising rate fuel pressure regulator. I didn't adjust the timing, didn't have a A/F gauge, no interecooler, stock injectors. I didn't know what I was doing. I ended up blowing a head gasket first. After I replaced the gasket, I ended up breaking a few piston ring lands.
This was in a time before there were so many choices in programmable EFI.