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Don't have the head yet but made progress anyway. Removed the old valves and springs so I could re use the valve springs on the new head.
Valve gear and rocker assembly removed
The rocker assembly felt a bit graunchy when moving the arms so I pulled it all apart, gave it all a clean and gave the bores and friction surfaces a light sand with 600grit. Nice and smooth now.
And the block all cleaned up. Used a scourer pad in the bores and removed most of the lines caused by the rings. I can barely feel the ridge now. It's got to be no more than a thou or two.