Hi Deadline thanks for all the input, I have been through all valve train from camshaft to valves, all the cam followers are nice and tight with no dishing on the cam lobe contact surface, they all lift up and down smoothly too, all push rods nice and straight, no play in the rocker arms, all valve guides are in very good condition most of the valves / guides have no or only just detectable lateral play so all is good there. Re seated all valves replaced two exhaust valves due to heads being slightly bent and faces being badly pitted, these were on cylinders No 3 and 4, the middle two and theses were the cylinders with lower compression pressures before the strip down. So just the tappets to sort out once the rocker shaft is back on.
Had a good day today head is on and torqued down to correct setting, push rods fitted and block waterways flushed through with clean water.