My exhaust manifold cracked a couple weeks ago and I finally had a free weekend to tear it all down and replace the manifold.
I did make the critical fail mistake and didn't align the studs on the block with the intake manifold so I definitely had to break everything down twice!
While I was knee deep I went ahead and changed the plugs (hasn't been done since I owned the Jeep) new distributor cap, new K&N Filter, oil changed and radiator flushed.
She is running like new after cleaning all the injectors and putting in new plugs.
She should be good to go for another 170K+