MUCH easier than the 4.3 or V8 swap you have in mind.
This an other forums have all the info you need for the 1.6 swap, it is by far the most common and well documented of the swaps I would think. Start with searching, there are many how-to's, even as far as the complete rebuild of the donor 1.6. Ask me how I know, I'm in the middle of this swap now...
C