Building a playtoy.......................…

I have a 1996 silverado z71. It only has 305 in it. I am looking to put a bigger motor in it. I would like to know what type i should put in it. I would like to know what type of gears to put in then axels. I also would like to know what type of true duel exhaust to put i on it and what mods i should do to the engine