So if the timing belt takes a turd you ruin the pistons/valves, possibly head and block 
Yeah if the belt goes the engine is a boat anchor. That is why Toyota encourage changing it every 60,000 miles. It's a cheap and quick job.
Geez, finding a different alternator for the 1kz is difficult. The years for the 1KZ in a Hiace are few, and the part number is hard to find a cross reference for also. I'll keep looking, but I wonder if it just has a different pulley than the 1KD model?
EDIT.... Stupid side note, the Ambulance Hiace (3rd Gen) was available with the 1UZ.
The part number I listed was for the Hiace 1KZ 110 amp alternator. It was a 1998.
Doing a little research, it looks like the hi end G spec HiAce had a 110amp alternator with an option for a 120 amp alternator.
These VIN’s:
KZH110G-GPDT
KZH116G-GHPDT
KZH120G-HHPET
KZH120G-HHPNT
KZH132V-EFPDT
KZH138V-EFPDT
110 amp alternator part #27060-67050 I can’t find a part number for the 120 amp model.
