What should i get next for my engine

[240o'clock]

So this is my first car in the scene and i was wondering what i should be upgrading in my engine next, Like cams or injectors etc. Im wanting to push close to 400$ i just dont know where to start at. It's a 1995 notchtop SR20det engine in a 90 HB chasis, Current mods to the engine is Toemi Fuel Pressure Regulator, Walboro 255 Fuel Pump, Megan Turbo Headers. I bought the engine with these upgrades so im trying to figure out where to start, like should i get some new injectors, cams or ??? ....

Any help's appreciated thanks.