AdReNaL!nE

I am swapping a 5.3 into my 1990 s10 2wd, had a question to see how well 4.8 pistons perform in a 5.3 block, and my current mods in the future are ls6 stage 2.5 heads, tsp 224r cam, comp lifters, trunion upgrade, ls6 intake manifold and any opinions on porting a ls6 throttle body? and I might throw nitrous on in the future and was curious on injector sizes, what would be good for N/A, how much can 5.3 injectors hold and what about the ls6 injectors? what injector size for 125 shot? and what important things that will really make my 5.3 scream