The 1 UZ ignition is operated by a crank trigger, and then has 2 (4 cyl) distributors, 1 mounted on each bank of one of the overhead camshafts. Also attached in each of these are a cam shaft position sensor.
There are several ways to connect to GM ignition
First the most exotic way, and 2nd most easiest, is to install the LT5 Corvette or Cadillac Northstar DFI Coilpaks and do away with the distributors altogether. This only requires the crank trigger replacing.
Although this is the most expensive way, it is still way cheaper than aftermarket coilpaks such as Electromotive, and still cheaper than a reasonable aftermarket computer system.
The next way is to install a Dicks Electronics signal converter box, that uses all the Toyota sensors, but converts it so that the Delco can read it. This is the easiest way as it requires no mods and engine does not have to be touched at all.
The drawback with this is, it requires 2 Holden V8 ignition modules, and that combined with the magic box brings the price not far behind the coilpaks above. Also when we tried this we had problems with the box, which questioned the reliablity, and of course the impossibility of buying another in a breakdown situation.
The third way which I am working on here, is by far the most cheapest and still quite easy to perform.
All it requires is the crank trigger modifying, changing it from 12 notches to 4 at 90 degrees, and adding a "grounding ring plate" to each distributor to stop cross firing, and this uses the Holden JE Camira ignition module, which is exactly the same as used in the TPI and TBI Chev distributors.
UPDATE NOTE, This 3rd way does not work.