at stage 2 your injectors at 95% can provide all the fuel you need. with the intercooler you might be able to push alittle more boost and could get to around 100% IDC. your car will run like this fine until the injector gives up.(think how long a stalled drill will last if you keep giving it power... about 1 minutes and then burn fire death). Anything over 80% hurts the injectors reliability, but upgrading injectors when your at 95% will net you 0hp gain only increased reliability.
i would upgrade the injectors if its a DD. if its a weekend or track car keep stock injectors. also you really don't need to upgrade the fuel pump, but most do when getting injectors at $80 its cheap insurance. and you don't need to go crazy 650cc would be plenty. also if your cheap you can get a fpr and your 560cc can flow 605cc @50psi.