Aftermarket turbo
#4
#6
assuming the rest of your truck is up to the task you could get a modified HX35 for a reasonable price. An HX40 would require lots of fuel but they work and a Super B would do you well but may not generate the boost you are hoping for where a SB special would.
I don't have any experience with ATS, or Ind. Inj. or anything else for that matter.
#8