Another option ... and update on my progress ...
I am forging ahead with Toyota COPs with built-in ignitors.
Toyota #90919-02246 for 3MZFE engines (Kluger in Aus, Highlander in US and other models as well). Picture back in post #45.
I now have 14 units to play with after picking up 8 for $9 each on fleabay.
I have managed to get some more info from Toyota on their wiring diagram ...
wire #1 - earth (12v-)
wire #2 - ignition (12v+)
wire #3 - 5v ignition signal
wire #4 - signal back to ECU to confirm firing (not necessary to use)
Before I was aware that they only use a 5V signal, I tested them at 12V (post #97 in thread "
using a coil pack ignition"). Luckily, it doesn't seem to have done them any harm.
I will be using MS-II or new MS-3 as a controller.
The COPs fit nicely into 964 valve covers as far as length is concerned. I need to source a slightly larger soft rubber seal for a gap-free fit. Planning to slice some a/c pipe insulation into rings about 1/4" thick for this.
The lower coils also need to be fixed in place so I will make up a set of retainers that use rocker cover studs or the existing mounting points for the original spark plug lead clips. I'll probably do the same on the top coils just to be safe.