I was under then assumption that ALL diesels no matter WHAT they're in are sleeved! I don't recall EVER hearing of a non-sleeved diesel!
As for sleeving a V-8 as long as the machine shop doing it is a good one and knows what they're they're doing and you know this to be true not self-claimed by the shop, you'll be OK.....
The new Hellcat Hemi's ARE sleeved 6.4L, 392's. (And this is from the factory!)......So I'd say that sleeves are OK....It comes down to the machine shop you have doing the work!