1. Stock throttle body is fine, if you were to go ported you would likely be running into more problems if anything.
2. It wouldn't hurt to run 60# inj and a better fuel pump, that way down the road you don't have to practically retune it if you decide to upgrade.
3. I would get a wideband if you don't already have one, that way you can tell if the car is leaning out when adding boost.
4. The worst thing that could happen is you push 20psi without knowing it, so just take it slow.