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Without seeing the picture or knowing for sure what's up with yours...I would still rebuild my own. Odds are you're going to end up rebuilding a junkyard unit anyway.
If the cylinder walls in your motor are not scored heavily, you can get away with a bore and new pistons worst case. I would definitely have the head professionally done. You don't have to go super expensive, but have a machinist check everything over. Might want to get it magnafluxed to be sure there are no cracks, and definitely get a valve job.
I would throw a mild cam in it, while you've got it all apart. Gaskets, bearings, and a timing set, and you'll have a pretty much new motor.
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1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank
Any 4.0 engine after 98 is pretty much almost going to have cracked heads... They changed how the heads were forge after 98 and the 4.0 engine was kinda junky after because of that.
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
I should note that the coolant on the pistons spilled out while removing the head, not from a blown head gasket.
I found an M715 in my area that I really want for it a really good price (missing the starter) Once I get this sucker running I may sell it and buy the M715, and a 12 volt 242 starter and have an m715 for 1/3 of the normal price.
No real point in replacing them all, unless you just like spending money. Have a machinist go over everything, they can tell you which ones *need* replacing and which ones just need to be reconditioned. You're not building a race car, right?
aa
1983 J-10 - 4.6L(MPFI)/CS130D/Hydroboost/NV3550/D300/44/44/3.54/Disc-Disc/32s/42 gallon 'burb tank
The body is completely disassembled and all on the new body panels are in boxes. Only after ordering the new panels, and cutting off the old ones did the guy realize he doesn't know how to weld to install the new ones. (It also sounds like his wife wasn't in love with the car either) it also has no engine or trans (which I view as both a plus and a minus. On one hand it won't be numbers matching, on the other hand it's not numbers matching so I don't have to feel bad throwing a BBC or LS in it.)
And my favorite feature. The guy that owned it before the guy I'm getting it from had a cage that meets all NHRA standards installed.
As much as Id love to go crazy and drop a 632 BBC in the thing, i doubt my bank account or wife would allow that. So what do you think I should put in it? Im stuck between the classic 350 and 454, or a modern 8100, or LS series engine. As far as Trans go Ive narrowed it down to either a TH350/400 for beating the snot out of at a track, and a T56 for general driving pleasure.
I would never put an iron big block into a camaro, ruins the cars driving dynamics.
If you just want a good driving vehicle, find a 5.3L from a junk yard and put that in. You don't have to worry about ruining the car since it is just a shell.
Also even though its an iron block would a 6.0 iron block be better than the 5.3 aluminium since its only 70 pounds heavier, has a better after market, its way more readily available at junkyards, and has a bit more cubes to play with?