In my limited experience of wrenching on my own vehicles (40 yrs.), I have learned one or two things about replacing engines.
If you rebuild the engine yourself, you are the only warranty. If it breaks, you fix it. This is also the least expensive route.
If you take your engine to a reputable machine shop, you have input into any special work you want done or parts you want installed. Unless you have the engine installed by an ASE certified mechanic, machine shops will only warranty the work THEY did if the engine fails. This can be hard to prove, sometimes.
Crate engines can be bought stock or customized. May not be warrantied unless installed by an ASE certified mechanic. You don't know the origin of the block or heads. Have the heads been resurfaced?, the cylinders bored or resleeved?, the crank journals bored with oversized bearings?
I have gone all three routes and personally I prefer the machine shop rebuilding my engine.
I would happen to agree here, I thought the warranty was only good if installed by and ASE mechanic, plus if it is under warranty without that I would bet the seller of the reman would have a lot of questions for you on why it failed.
I did my overhaul but didn't get it bored out, just did the valve job, replaced rings and bearings. It ran me about 600 to 700. I think if you buy a reman for 1100 and then have to have it installed, to me it would make more sense to do it yourself if you able. Like others have said it is valuable experience.
1984 CJ 7
1948 CJ 2A
1982 CJ 7
1981 CJ 7