There are a few factory bellhousing used with the NV4500 (not to be confused with the lighter duty NV3500 and getrag 290 5 speeds used in S-10, 1500 and earlier 2500 trucks).
The early external slave version:
View attachment 2654460
This one will cause issues with driveshaft clearance on account of the slave cylinder location.
Later they used internal slave cylinders, which I'm personally not a huge fan of. I don't have a photo but I think a guy might make one work.
Advance adapters also has an NV4500 bellhousing to use an external slave, I used that in my FJ40. It works fine, but is not exactly optimal. The slave cylinder doesn't have much clearance to the frame and would be trickier with a v8 (my FJ40 has a 4 cylinder). There was also some screwing around with a mix match of parts to get the clutch/throwout stackup correct. Apparently this can be averted by dropping another grand on AA clutch componenets.... Quite a few people have done it however.
What I'm going to use in my FJ62 for the LS swap is this:
View attachment 2654463
This is a relativey recent release from Quickdraw. The slave cylinder (a stock Jeep unit) mounts tight right next to the trans in the hole shown midway up the left side. It also uses the factory clutch components for a factory 6.0/NV4500 truck. These are readily available from LUK, Sachs, etc for good prices on Rockauto and elsewhere. The bellhousing is made for the LS as well. Of course you can use a regular small block bell for an LS, but there are a few differences that make this a better design and superior option IMHO.