Valve train noise

You need to pull a lifter, carefully remove the guts, stack some washers in until the push rod cup for the lifter is tight up against it's retaining ring and check your length with that. It will require removing the rockers and measure the adjustable push rod length with calipers.
GREAT INFO,DANO!
This is mandatory,to acheive consistent readings. The lifters pumped up,good for 1 or 2 revolutions,bleeds down. Just did this,last week. A suggestion: When you do this,hit the top of the valve stem,with magic marker.The rocker will leave a pattern. You want it centered. Let's start with that.