360 engine vibration

Also to add it starts straight away , initial timing is 16 deg and 32 at full advance, vac gauges reads a nice steady 20 at idle. Took the rocker covers off today and thought this was the issue, with the rockers crossed over, however made no difference.

I have a slight leak on No1 header at the manifold gasket but that's it. When I first got the car nearly every cylinder leaked, once again no improvement to this shake. Open headers or full exhaust no difference.

As Ive been fault finding this car and engine its amazing how many things I have found incorrect, put right and made no difference to its running!

could incorrect cam timing cause this symptom?

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