Welcome...
first off...click the link my signature for info...I'll answer the ones you asked tho here...
1) .055"...get autolite 605's since you plan on modding.
2) No...throw them out.
3) I do mine every 30k...but I'm anal...most people do it every 50-60k...it takes 2 full bottles of GM S/C Oil or Mobil1 0-20W Full Synthetic.
4) See link in my signature...
5) High octane fuel...a good tune...dexcool delete mod and new LIM gaskets should cover it.
6) Meh...just throw a cone filter on the throttle body and be done.
7) Keep the resonator. That's how it's done.
