There are definitely factory 4.30 IFS front diffs out there. In addition to the one mentioned above, they were also found in some 5spd V6 2nd gen 4runners (maybe with the 31" tire option?).

Actually, if you're interested, I can check with my dad, he may still have the 4.30 front diff from his 95 4runner, and if so I'm sure he'd be happy to sell it off.