I'm thinking about installing a free ECU like Mega Squirt and install Coils on Plugs like ABZ has. Extra trigger wheel (on pulley or S6+ or S8 flywheel (60-2 trigger) and using the standard ABZ hall sensor to have real COP.
With that I could adjust a fuel trim and also a spark "trim" for each cylinder because the manifold and my hand work on the heads isn't perfect (perfect only CNC can do).

But I also think about using a ABH ECU with stock hardware (distributor etc.) but with extra mapping. Then you have to install ABH camshafts (because of the distributor) or to modify the camshaft. One camshaft end is longer than ABH camshaft and without nut for the distributor. Shorten and make a nut.

Here you find pictures of both parts:
Head: http://www.v8schmiede.com/include.php?path=forum/showthread.php&threadid=43
Block: http://www.v8schmiede.com/include.php?path=forum/showthread.php&threadid=63

I only would use ABH/AEC engine parts, because there are some differences between 3.6 and 4.2 (extra pins for the cambelt and some other details).

I will need some time to fine this project because I only can work one weekend in a month, when I visit my parents (500km away from my work where I life).