I ran it pretty hard tbh, but with the new build was a completely new engine,
i also rebuilt the head with new springs/retainers/valves/valveseals and there were no signs of any damage when the head and components were checked.

I did spray carb cleaner around all the vacuum lead whilst it was idling to find a vacuum leak, i will double check the PCV to intake mani pipes tho, thanks, ste