Top end tick coming from top right side of motor.

Thank you for reply.Question:Why not check w/engine idling?Are coil packs a problem?I would only need to run motor for about 60 seconds.Are followers pump-up style? Wouldn't this be a problem when checking for loose components? Is this top end tick common/uncommon to the Northstar engine? This car has been running/driving since purchase for about 1000 miles before I heard noise(tick).Obviously previous owner was aware of problem.Hello everyone:LET THE BUYER BEWARE!!!My fault,I take full blame.Anyway motor runs strong thru full RMP range.Tick not there @650rpm but @750 rpm, ouch!Can I just slacken chain tensioner,unbolt cam sprocket, remove cam caps and get @ followers and inspect valve stem tips? I have a strong background in small/big block Chevs and English/Italian motorcycles.Again many thanks,Louwelds.