4.8 ls ticking noise help

[Sweetc10]

Hoping some of you guys can lead me in the right direction without tossing money. I have a 68 c10 that I just installed what I think is a 2005 4.8 , did the msd and carb set up. Had the oil pan pulled and checked by a shop rebuilt the heads and put a small cam in. My issue I'm having is once the motor warms up I get a ticking noise that revs with the rpms. I pulled the valve cover wiggled the rockers the ones with valves up all have little wiggle , the ones started pushing valves down no movement. Also started truck with valve cover off they all moving like supposed to. Could hear the tapping but couldn't really pin point which one was doing the tapping. Sorry for long post just trying to put as much info as I could. Thanks for any help