I have a pertronix on this car and from what I can see so far it looks like the reluctor, which has a spring clip on the top to secure it, has slowly slid up the shaft and pushed the rotor upwards. its still all apart as I removed the plates to check the advance weights while it was out. I will post pictures this weekend when I put it all back together.
hopefully thats the problem but will have to get it back together to see. it would explain the movement Ive been seeing in the timing above 2500 rpm.
cheers
Barri
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