Orrrr.....you could give a 2TR swap a go? 
Looking at car-parts.com, they're actually slightly cheaper than the 3rz's. Weird. No idea if it would be cheaper overall for everything needed though. Probably not because I don't think my W56 would mate to a 2TR in any way.
Might be cheaper because it has not caught on yet. When I bought my 3RZ back in 2004 with everything including Catalytic converter, flywheel, clutch, complete engine and interior wiring harnesses, all engine parts, all ECU, all sensors, etc, it only cost me $400. Seriously. For everything. Today you'd be lucky to find just a good low mileage engine for around $650.
One thing to note about the 2TR, while it is better in terms of torque and efficiency, it will be much, much more difficult to get smog-approved than compared to a single-coil 1995-1997 3RZ. You are right about your W56, that will have to be replaced with (ideally) a R151F (which are like gold, selling for ~$800 if you can even find one [their bellhousings alone sell for ~$400]), or (less ideally) a R150F (which can be had for ~$150 -- but you'll also need a $350 adapter kit to use your gear drive t/case = ~$500). Then, you'd have to upgrade at least your front Crawl Box (or t/case if you've only got a single setup) to a 23-spline input, so that's another $200.
But aside from all that, it's the emissions and stuff related to your fuel tank that is going to give you the most amount of headaches between a 2TR and the state of Commiefornia
Even though it is an indisputable fact that the 2TR-FE will have less pollution than whatever you have now, you will have to jump through so many bureaucratic control-hoops that you wouldn't have to worry about with a single-coil 3RZ-FE.
If I may ramble a bit here, the quad coil 2TR-FE will not integrate with your single-coil tachometer. It's purge canister does not integrate with your factory purge canister mount (the single-coil 3RZ-FE's purge canister is compatible with even a 1979 carbureted 20R's purge canister mount), the dual and quad coil newer engines have two cats instead of just one like the single-coil 3RZ-FE, and you will have so many more electronic solenoids in comparison to the more simple single-coil 3RZ-FE ... it will just be a lot more work to get it to pass the referee.
The 2TR-FE is doable, much more so outside of California, just make sure you are up to the extra challenges associated with it. The end payoff will be sweet
VVT-i in a Hilux Rock Crawler. That is pretty cool!!
Regards,
BigMike
