Why do I keep breaking rocker arms?

Specs have been hard to track down, as the rebuild was subbed out to a supposed 'slant expert' in Texas (don't have the name). Texas built the engine with a 'performance' cam of unknown nature and I'm pretty sure everything else is stock.

I'll add pushrods to my 'more info needed' list.

#2 and #5 valve adjusters appear taller because those two valves are lower, which seems odd as one is intake and one is exhaust. I realize that this is a dumb question, but are the valves all supposed to be at the same height?
Actually, a lower valve height would require running the adjuster screw down in to take up the clearance, that intake #2 is at least 2-3 threads higher up out. There are also different color adjuster screws, are they all the same length? The exhaust adjuster ball looks small in the cup, like the cup is 3/8" dia., or ball is 1/4" dia. They should be 5/16", even if the pushrods are 3/8", so...