Another option could be a 1MZFE 3L V6.
These are common (coming from Camry's), cheap to source and have plenty of torque in the ranges you would utilise for a van. The 1MZFE uses the same bell housing bolt pattern as 3S motors, so there is a good chance it would work with your current gearbox.
If you get a VVTi version, they are 156KW @ 5800 rpm with 328NM @ 4400 rpm.
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