Question on Comp Cam Rockers 1622-16

All,
I have encountered a MAJOR problem with my "professional" built stroker engine that used these CompCams rocker arms/shafts.
1) Engine was run on dyno(maybe a total of 45-55mins run time) in late january for Cam break-in and power assessment. Other than a few frustrating oil leaks, the engine performed well and ran smoothly.
2) Just re-installed the engine in my duster last week, but some temp exhaust collectors in place and drove the car about 4 miles to my home for some clean-up in prep for a trip to the exhaust shop for a piping work.
3) started the car 2 days ago just to let it idle some and clean up installation, etc.. and planned to drive it a few miles. BUT.....
If i gave it throttle just off idle, a VERY LOUD, inconsistent hammering sound started to happen. First thought it was a bad backfire, but after about 1-2 mins clearly defined it be a hammering sound from the driver's side valve train. Stopped the engine.
After a sleepless night, I Pulled the valve cover expecting that maybe one of the rocker arm lash adjustment studs had become loose and it would be a quick fix to reset and tighten it. HOWEVER, I found two of the pushrods(intake on #1 and exh on #7) to have gaps of ~1/8 inch btwn their tips and the rocker arm cups? the #1 intake rod was able to completely hammer onto the edge of the rocker cup. ALL adjustment studs were still very tight. Decided to call the engine builder before I investigated further.

Over the phone, he was receptive to help investigate/fix the problem:
1) We verified that these rocker arms were indeed suitable for MOPR 360LA use.(but we know that already)
2) Asked me to feel the push-rods to see if they felt oily. Even though I ran it the day before, they all felt completely dry which questions if they were getting any oil?
3) I looked for signs of metal wear-down/grinding at the cups/push-rod tips but could feel nothing with my fingers & could not see any "shiny bits."
3) PLANs are to take the car on a trailer to the builder in Louisville Ky. tomorrow to pull the rocker arm shafts and determine if the shaft oiling passages were properly aligned at installation, assess any damage, etc....

ANY ADVICE on what type of installation errors/parts failures could lead to this condition?
-THX Scott M.