Make sure you have all your gaskets ready to go along with new head bolts (they get over tightened when you install them to "stretch the bolt" so they have to be replaced every time), make sure you have a revised tune for the heads, check the springs on the heads (what kind are they) some brands have been known to fail, ditch the tb spacer.
And Welcome to the forum, good to see another reg. cab short bed on here.