Injector size? Options

[Taxiwardance]

Need some opinions. I'm getting ready to toss a bunch of shit on my car and need to know what size injectors I should go with. Currently for mod’s I have - K&N filter, Free mods, Custom intake, Magnecore wires, balance shafts removed, under drive pulleys, rewired 190 Walbro fuel pump, MBC at 14 PSI, Evo 3 16G, 2g manifold, .020 95 pistons, Fully rebuilt and balanced 6 bolt, rebuilt tranny.

Next week I’m tossing on Apex N1 3 inch down pipe, catback, and straight pipe, 2.5 O2 housing with atmospheric dump, Dejon tool lower IC pipe, and upper 2.5 inch pipe for a GM blow through setup, Supra side mount intercooler, 3 Gm MAS with Ramchargers translator, and a 2600 act clutch. Should I go with 550cc's or higher? Also is there anything else I should toss into the mix before I get to work on this filthy whore? Should I get a FPR, and what would you guys recommend?

[SCCA Stang]

does 550 injectors limit adjustability to your MAF-T setup???

or just limit HP that you can make

if your goal is lets just say 300-400 WHP, are 550's enough???

just curious because I already have 550's and would hate to swap them out again needlessly