If you're trying to make the March 22nd NHRDA race, I'd continue with the transmission work so you can actually launch hard (97mph should be 13.8 range with a 4x4 boosted launch). Many trucks have ran low 12's and high 11's with your current turbo. It won't last forever when pushed that hard, but it is capable of the required air flow. In fact, Bponci hit 10.76 with a Super B Special on his purpose built 4x4 single cab Ram drag truck.
I would upsize your injectors from the current 5x.011" to 5x.014" or even better 5x.016" run well on 12 valves with 64mm S300's. Since you have those upgraded delivery valves, you're probably going to run a little warm on the top-end.
For timing, you really need to bump it up to about 26*, it will help with both horsepower and exhaust temps.
For fuel pressure, your cheapest option is to add a Walbro 392 on a separate filter and feed it to the front port of the injection pump. I'd put it on a toggle switch and only run it at the track or dyno or whenever you need big HP. You'd likely also want to add a check valve to the feed line from the current lift pump so the Walbro doesn't backfeed your current pump if its pressure and flow exceeds the current pump.
Later when you have more time, start playing with a twin/compound turbo setup. Your best bet for spoolup would be to sell the 64mm and go smaller say 58-60mm for the manifold charger and compound it with a GT4202, S475, or whatever you come across for the right price.
