1996 Chevrolet Blazer rocker arm adjustment

This is what happen I was doing valve cover gaskets and I remember that there was noise like a ticking iv work on cars all my life so I thought look and see if any rockers was lose and was so I thought like old small block 350 chevy motor. So I gave it a little turn and it will go away well NO when I starterd it back up it missed bad so I shut it back down and losing them back up and now I cant get it to run at all it trys to start but wont iv done everything I can think of had lots of guys look it to make sure I ant over looking something and these guy have years on me when it comes to cars so now I don't know what to do iv got books after books and still get it so plzs help thanks [ its got fuel] [ its got firer ] iv even put it up number 1 fireing still no go