S-AFC and Z32-MAFS: biggest injectors possible?

[SloS13]

To make a long story short:Ive got an S-AFC II, a Z32 MAFS and a top-feed fuel rail.

My question is: Whats the biggest injectors I can run with this setup? Ive been told that RC 550's will not work. I hate to be picky, but id prefer answers from people with this same setup.

Thanks!

[C-Kwik]

while I don't have that set-up, the issue will be whether or not the injectors can have a short enough pulsewidth at idle to idle properly. 550 cc injectors should be fine.