This is one of those weekends that could turn me into a Honda owner.
Most of it was spent chasing gremlins out of my '70 145.

Late in the afternoon, my wife starts up the 740Turbo for the first time today, and drives it about 10 blocks. (getting thunderstorms of late)
Stays there for about 2 hours, comes out and the bugger won't start.
Before towing it home I was able to do some shade tree troubleshooting.

Engine turns over, no rise in the tachometer, I can feel the fuel pump relay engage. Unplugged #1 plug wire, and plugged a key into it at held it close to a ground and cranked the engine, no spark. Did the same with the H/T lead coming from the coil, no spark there.
With the ignition on I can hear the fuel pump buzzing and feel the regulator vibrating.
Checked all of the fuses in the panel, they are all good.
Checked the plug going to the ecu, it appears to still be snug. Didnt reseat it yet though, and havent had a chance to see if +12v is getting to the coil.

This has happened before intermitantly, each time it recovers by turning of the ignition then trying it again, and it will start after the first time.

Some other factors (probably has nothing to do with this but never know):
The fuel pump relay went out shortly after we bought the car 7 years ago, fixed that be resoldering all of the points on the pc board.
The cruise controll went south a couple of years ago, checked all of the vacume and electronic swithches and swapped the cruise vacuum pump out.

What are the common things to check on the 89 740Turbo?
I'm suspecting the spark is probably triggered by the Camshaft position sensor, which by its name I'm assuming it somewhere near the top of the engine.
That, a broken timing belt, or a blown ECU are my other suspect.
Any one got any ideas of what I'm missing?
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69 is 145, Webber converson, pretty much stock other than that