thanks all, I think the Ebor plate will do the job, just need to find my old CR calcs from years back when I did the engine build (I think its around 8.5 ish)
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I remember at the time that I changed the cam too because my std cam was well worn and a friend offered me a lesser worn RR or SR cam (don't know which, if they are different?), lesser worn meaning the peak lift was a bit down, but rest of lobe/bearings were good.
What are your thoughts on how best to setup timing etc since the rest of the engine is stock, iron head '56 Flash??
PS I know that all this is far from ideal but as long as it starts easily and runs smoothly, performance is what it is, its only for comfortable cruising really.....cheers