Z31 300zx, with a different bellhousing. The turbo and non-turbo had different bellhousings too, though I'm not sure how interchangeable they are. They ran the Nissan VG30E V6 you also get in the trucks. I don't think you'd fit the turbo model in the engine bay easily.
Good luck finding a cheap manual transmission or bellhousing from a Z31 300ZX though. Closest I could find in 6 months of looking was a reconditioned gearbox from some crew in SA for about $1100
The gearbox matches the RB30 as well, used in patrols, skylines and VL Commodores, but the straight six is too long for the engine bay.
Best bet is get a Nissan V6 and manual box and transfer case from a later model Navara or Pathfinder. Came in 3 and 3.3L. I believe the transfer cases are the same, so you should be able to slot the whole engine/gearbox/transfer case in without a drama. YOu will likely need different engine mounts on the chassis.