I am contemplating a similar thing, but am still trying to work out where to go with what mods.
Info rec'd from other forum members is that Mazda Series IV RX7 Turbo LOW IMPEDANCE injectors are the ones to use. I am lining up a set from a local Mazda shop for $450. The big problem is making sure they are matched. Last set they made up took over 30 injectors to geta set that was matched to within 2% flow. This ends up 1/2 price on the new ones from RC through Reg Reimer.
I'd be interested on how you go, as I am debating the worth of the mod by the time it all adds up.
Where did you get your AFM from and how much for ?