Thanks for replies,
Turning distributer by hand and listening to tick-over is how I adjust timing and using timing light.
However, I reckon now that camshaft + chain are worn out. When cold ignition moves about all over, so hard to get a good reading. When warmed up, engine revs scream, so must be getting fuel and good spark
I've concentrated on fuel pump & carb & ignition and hadn't thought of other essentials like valve timing.
It doesn't look like an easy job to replace camshaft with engine in the car.
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