Of course chevy guys will be screaming LS..lol
That piston IS short! Guessing the super valve spring is for bigger lift without stressing them out, but there sure isn't much guide there. And not sure what that thing is on top of the lifter, maybe just something to take up space and keep the pushrod shorter? Oil squirters were used on the 5.0 when they started pushing them harder. Looks like chain drive oil pump.
Now, if they could just make the truck so you don't have to pull the damn cab to work on it. Not that it matters, it'll still be a $50k-$60k-$80k truck, so I won't be able to afford one.