I removed my rail with injectors intact, It made it easier for me to assemble everything on the workbench rather than down in the car. Besides if you are this far into it why not replace the injector seals and the whole set at Advance is 3.50 give or take a dime and it has 4 large and 4 small and only takes a couple of minutes with injectors out (Cheap Insurance)
. If you need i'll dig out the receipt and get you a part number. Take care to catch the washers if you remove the injectors, I found it handy to use a magnet right before the bolt is out.