You'll find anecdotal evidence both ways on Jasper - most of it negative. I haven't heard of the other rebuilder.

The 3.0L engine seems to be difficult for rebuilders to deliver a good product. My own experience leads me to believe they don't understand the need to check head bolt clamping range - particularly if the heads and/or decks are milled, as most of the failures we hear about involve blown head gaskets. If you ever build one of the 3.0L engines and pay attention to details, you'll see why they run into trouble.

If I wanted to use a reman engine, I would remove the head bolts one at a time and install ARP head studs before the engine was installed. Alternatively, I would remove the heads, clean the deck holes and measure the bolt lengths.... making whatever adjustments might be needed - then put it back together with new head gaskets.

There is also a warp/etching issue with the lower intake that can cause coolant leaks - and several other "gotchas" that can raise their ugly heads.

Your signature shows 28K miles on a reman engine - I'm curious why you're asking the question.

Frank