@SWE_lollo03 ,
The lifters on these do not lubricate the top end. There have been some that have swapped to solid lifters, I do not appreciate the advantage in this application.
Melling, Sealed Power and a couple other reputable companies make the hydraulic lifter used in this 2.9l and are VERY reasonable.
If you chose to use a more aggressive cam, you can expect to need a stronger set of valve springs; they do not need to be top dollar designers, I have used V8 dual springs sets that fit the bill.
In regards to the cam, I recommend having a custom reground at ⅓ the cost, verses buying a replacement, unless your is broken. There are several good cam grinders and builders near me; they are both more than capable of regrinding your cam or selling you a "cookie cutter" (one size fits most) premade cam.
There are other ways to improve your engines efficiency and performance, going strait to the cam is not my 1st choice with this power plant. In fact, the cam is more like the last thing I would consider.