No ill will intended at all man. Just that your first post talking about building a 2.5 puller and wanting to run an hx40 makes it sound like you're jumping in over your head. I just hate to see people go into things woefully unprepared and end up getting embarrassed or breaking their truck that's all.
As far as parts, I'd for sure stud it, and look into getting it o ringed. While the heads off do some backyard porting on it, every little bit helps.
Start with low to mid 20s for timing since you still want to drive it some on the street.
I'd probably run 5k gov springs instead of the 4s. They tend to fuel harder even under 4k.
You'll of course need a fuel system to feed the injectors and DVs too. Personally I think I'd build my own with an A1000 as opposed to buying something like a FASS or Airdog.
As for the turbo what are the rules you'll be following? Is this a 2.5 workstock so stock appearing or can you run something plainly aftermarket? Something like shegotmecummin suggested would work well for street driving and would make the class, but you'd get more power out of an S400 frame of course.