I had sorta the same issue.... run pig rich, absolutely no power after 4k but seemed fine under vacuum/cruise.... tested injectors with ohm readings and they were in spec. Replaced damn near everything. Wire's , plugs, fuel filter, resistor pack ect. I also had FIC 650's. Had a set of 450's...
I don't see any reason why it wouldn't be ok?? Just keep your boost low until you get the wally. As long as your afrs are in acceptable range you should be good to go.
Keep it simple. Don't go balls out right away. Make sure you know someone that is knowledgeable with Dsm's to help you along your path. If you do that you will learn more and more about your car and enjoy it more than hate it. Any questions just ask anybody on this site or just study all the...