If it's just a tapping or ticking it's more than likely just a sticky lifter. Mine has had one for a long time and, like yours, it doesn't burn any oil and has good oil pressure. I did have it progress to a bad knock after it sat for a few months following a rollover but that turned out to be carbon build up on top of the pistons. A little water and diesel down the carb followed by some 3500 rpm revs and it blew black, purple and blue out the tail pipe and no more knock.
'84 CJ-17: 17" stretch, locked Toy axles, 5.5" lift, FI, AX15, D300 w/twin sticks, boatsides & junk.