You can absolutely make 600whp with the stock fuel system on a stock engine by upgrading just pump and injectors. But there are some caveats.
I would recommend a fuel pressure gauge and of course an A/F gauge, preferably one for each bank.
At this type of flow, you are asking a lot of your fuel system configuration. When you run your fuel system to its maximum potential, all the little differences begin to matter.
With this type of fuel flowing through the stock plumbing, you are going to see pressure drop just before the rails. Unfortunately there is no where to tap a fuel pressure gauge into the rails themselves, because that would show the real situation.
But anyway, when you are pushing your fuel system to the max... what that max power actually is depends on many more variables than just "what injectors" and "what pump". This is why you want to have at least the A/F data so you can know when you are pushing your luck.
Keep in mind that with the 11:1 compression ratio of the stock engine, one degree of ignition timing can make 15-20+ HP difference. This means that if the car is tuned aggressively, it stands to make a lot more power out of the same fuel system as a car that is tuned conservative. If you tune the car super conservative, you are going to start seeing your pressure drop earlier in the HP. Once pressure drop starts, you are going to run out of fuel very quickly.
Also, if you run your car in the pressure drop zone, you can expect your tune to require changes quite often. Because when you tuned your car around a specific fuel pressure curve, and then the weather outside changes that fuel pressure curve, that can have big effects on your A/F.
But ya... it can definitely be done. But you might find that you dont make it that far. It just sorta depends on tons of things.
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