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Try fitting the rings and offering manifold to head without gasket fitted to check gap between the two.
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Richard,
I spent a few delightful hours stripping the manifolds off of the engine, cleaned all of the parts, then assembled everything dry, without gaskets. The intakes slipped into place very easily with the rings locating the manifold to the ports quite well.
Then the exhaust manifold slipped underneath - again, quite nicely. There was a gap of less that 0.5 millimeters between the head and the manifold - this would have quite easily have been sealed by a new gasket.
Frustrated now, I figured it is time to pull this engine out and see what is going on, I drained the oil and noted that it smelled quite strongly of gasoline. I recalled that there was plenty of gas coming from the recirculating valve when the engine barely ran. I suspect that I am experiencing severe blowby - and need some new bits inside the old motor.
I shall keep you informed ( perhaps in the resto pages
) of what we find inside.
Thanks to everybody who offered opinions about why it ran so poorly.
Stewart