You could check the springs for coil bind....too much lift for the spring installed height, will bend pushrods and break springs, retainers, rocker arms, and or all of the above....

Were the pistons fly cut, or are you just referring to the stock valve reliefs???? Sounds like waaaaaay too much cam for the rest of your engine anyway.... With that much lift, should have checked piston to valve clearance with some clay on top of the pistons and crank the engine over by hand.....

A click is hard to define on here without hearing it, could be improver valve adjustment, valves hitting the piston, or other things..... Have the heads been milled???