Questions about a 2006 5.7

Have barely driven this, but it is fun when I do drive it. Sounds great at start up, the longer I drive, the louder it gets. Seeing where some have gone to a 8.125 pushrod on the exhaust. but it sure sounds more like an oiling issue than lifter tick problems. Thought maybe the PVC system was not allowing oil down quick enough, inside of the valve covers are wet with oil, but no real puddles. Sure seems like there is area for the oil to pull if it was getting there. Got some adjustable pushrods to check length, but when I do get the length and tighten the rocker, the valve opens and then closes again, so I have to be into the preload already with the eagle length stock pushrods, right? Guessing I need to find an oil pressure port and hook a mechanical gauge up there before I pull the front cover off again and replace this new pump?