As far as I know the only fuel rail difference on 4AGEs (ok, the 16Vs) in bigport vs smallport. The injector spacing is different. GZE and GE have different fuel pressure regs (GE being slightly higher pressure funnily enough). But I guess you won't be using the factory FPR anyway.

I've never heard of anyone running into problems with the stock fuel rail, though that is by no means gospel.