Timing belts vary from motor to motor (1UZ vs 1JZ vs another etc)
Some are at 100,000km, some are at 140,000km, some are between.
If you don't know what has been replaced on the motor, and you intend on doing another 50,000km+ on it, I'd replace everything.
Off the top of my head.
Oil
Oil filter
Leads
Plugs
Dizzy Cap
Rotor
Accessories Belt
Accessories Belt bearings (tensioner, idler)
Timing belt
Timing belt bearings
Waterpump
Coolant
Thermostat
Clean the ISCV
Clean the throttle body.
Fuel Filter
Air Filter
Power Steering Fluid Flush
Autobox Fluid Flush
Thats about the limit of what I did to my 1UZ before I put it in my car (still yet to do water pump and timing belt bearings, but I've done the rest).
Not 100% on total cost there, but on the 1UZ that would stack up to about $1200-$1500ish, depending on if you pay full price for everything, or trade.
But that should see you almost 100,000km without touching anything, and a minor service 50,000km after that.
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