You can run a GT28 but you need to look at the rear housing size. A .63 rear housing will give you good spool and the gt28 will have more than enough poke to go all the way to 7000rpm (or just under).

In regards to manifolds, i would run a tubular manifold with tuned length runners. T25/gt28's are all internally gated so you dont need to worry about wastegate attatchments.

ECU, I would run a Haltech or Hondata, then look at upgrading injectors to 440cc at a minimum, a Walbro 255 combined with a higher flow fuel rail and fuel pressure reg. A heavy duty clutch and 2.5-3in exhaust will see you out.

If you need engine internals etc, I am a Bisimoto Engineering dealer and can supply pistons/rods/cam etc to help you when the next level comes.

Lastly, remember that a stock D series is only good for about 200whp on stock rods. Any more and you will throw a rod out the block so just be mindful.

If you need anymore help feel free to call me