my engine is the straight 6 258,4.2. I haven't done a "complete" overhaul, but I have replaced the valve cover and gasket, the fuel pump gasket, oil pressure sending unit, oil pan gasket, and distributer gasket.
I was more referring to rings and bearings, timing chain, etc. and not gaskets and seals that dont really add to the substantive longevity of your engine.
Other post are implying that you are not comfortable with your engine, I did not get that from you, you obvious feel that your engine is strong and sound. By all means, you know the engine better than any other, and I would enjoy it depending on your comfort level. I drive a 304 with 100K miles and while I trailer it to Colorado etc, I could drive it to Colorado, but choose not to (because I like the smooth ride of the long wheel base, quite, satellite radio/cd, a/c, comfortable seats, 85 mph even while towing of my F150 when doing a 600 to 1000 mile trip.)
However, If I were considering putting on FI on my 304, I would do it on a low mileage engine, just because it make better logic. The cost to add FI is probably at least twice what a rebuild would be. I am saying "first things first" and having a good platform to add fuel injection to, IMO is more important that the FI.
As I state in my first post, If you are willing to spend the bucks, what would be great would be a new engine (ie freshly rebuilt) AND
then add the FI.
I dont know if you can add the "teamrush" up grade to your model jeep, but if you can, do it. It is very easy to do and, for less that $150 (I did mine much less) you can make a good running jeep run even better and increase fuel efficiency.