Yup, I make an adaptor kit to fit a 1600 into a SJ413 or Samurai.
The kit contains all the bits to get the motor bolted into place, and some instructions. Cost is $200.
You can use the Vitara power steering in a 413 / Samurai too. You just need either a wedge mounting plate, or a flat mounting plate and a funky steering shaft angle.
I have made bolt-in adaptor plates in the past to mount a Toyota Cressida power steering box to the chassis.
I went this route as it fits in much nicer, clears the radiator, doesn't require any steering shaft modification, and the boxes are cheap.
Mmmmm.... power steering.
Ben