Sounds like you are trying to save some money...
First, since I have a 1.3 head on a 1.6 block, I see no reason why you couldn't put the 1.6 on the 1.3 block.
On the fabbing front, you would have to make or buy a wiring harness. If you can understand a vehicle wiring diagram, you should be able to graft the 1.6 engine wiring (with the ECM) onto the Samurai. I would think that the ECM might not work as well as it might be expecting a 1.6 engine... Just a guess on my part -- nothing based in fact.
TracKick PS units can be installed on a Samurai. Visit Sean DeVinney at
http://members.cox.net/aftermarket4x4/index.html. He can provide you with info on how to do it. He also has PS parts, too.
HOWEVER...
I would part the tracker (except for the PS system -- see Sean for exactly what items that you need to keep...) and use the money to get a working 1.6 in your Samurai.