having just stared with my brother at it for 2hrs. We decided to look at other things, the timing is right. Although, I do still want to clock the top of the piston to double check to be 100% sure we are spot on.
My brother has an old series engine kicking about and that too has the 90deg adaptor, but the distro shaft that clamps to that has a recess, mine don't. So maybe the distro is clamping down hard on the gearing underneath...can't see why that would cause this issue, but it's thing to check.
 
When did the rough idling start?
Since I brought the car 1 y ago. I lived with it, and to be fair, it's rough running really, not just idle. Just not noticed as much when revving engine. It's now running slightly worse, so maybe a rethink on cam shaft position is needed. All valves are opening and shutting at the right places when I rotate the engine.
 

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