I need help creating a basic upgrade path for my ej255

I’m looking to get a little more power out of my v2 ej255 in my 07 Legacy Spec B. My short term goal would be to make around 300-320 whp, but if that’s risky for a stock long block, then I’ll settle for less. From what I have found with some light searching I need a new fuel pump, new tmic, possibly new injectors, and an electronic boost controller. Please let me know which parts are required and some good options of said required parts.