I reckon it'll have the FZJ 4.5 petrol motor, as the OP references to a petrol 100 as comparison in the first post. Personally I really like the 105, it's an 80 with the newer body. What's not to like? People are struggling to find decent 80's to buy, so a 105 could be just the ticket to get a rugged, tough, well engineered LC that hasn't suffered such a hard life, or seen so many salted winter roads.
The down side is that as the 105 was built as a rugged vehicle it didn't get the HDJ engine (IIRC), so a lot are the less powerful but longlived 1HZ, many if these receive aftermarket turbo installs with varying degrees of success. Or you got the petrol FZJ, which again is a simple, tough engine, with more refinement than the diesel but a bit more thirst. As I wanted an auto I bought a FZJ, I'm not even sure if you could even get the 1HZ with an auto, that would be a bit sluggish. It's a great truck and I haven't regretted my decision, the FZJ is very quiet, smooth and capable.
The specs are a bit different to what we're used to in the UK, the twins tanks is a great help, but more often than not they don't have the OEM axle diff locks. Obviously aftermarket items can be fitted, and you could look at it from the other perspective, if you went to via an 80 chances are the axle diff locks will be U/S due to lack of use or corrosion. So you'd have to spend money on them any way.
OP - You have a nice 105 there, if you target your market you should get your money back. The petrol engine might scare people off, but it has been discussed may times on here before, the petrol isn't actually as bad to fuel as you may think, the MPG difference between them is not that much. Plus petrol is cheaper to buy than diesel, and the cronies that decide car policy in the UK are now thinking that diesels are the spawn of satan.
An FZJ105 could be just the ticket?
edit: OP confirmed the FZJ whilst I was typing!