It looks like a 77 series, maybe a HZJ77 if its diesel, which would mean it has a 1HZ diesel, not a 2H.(unless its had a retro engine swap)
The roof is probably the original colour. The body looks like it has a had a few patch ups, especially the front RH fender.
Have a close look around the windscreen, looks like a patch up on the left hand bottom , they often rust there.
It has a few parts which don't correspond with the year. Like the grill and those tail lights dont normally come with that bumper, but that could be market specific.
The front RH spring pack looks likes its over to one side.
Spring pack looks like it has had a leaf or 2 removed.
Missing a windscreen wiper arm.
Exhaust pipe looks a bit smaller diameter than normal
I would ask to see a cold start, meaning the engine has not been started at all over night. It should start almost immediately with only a flash of grey exhaust smoke.
The gearbox should be a little stiff when cold and loosen up and shift smoothly after a few shifts.
I get the impression its had a hard life, so I would spend a fair bit of time looking at it and asking questions. $6500 is not over the top, but it will almost certainly come with a few hefty repair bills.
Get some engine pics and pics of the aluminum plate on the firewall and then we can decode the info.