just stripped an engine that was knocking from an xr3 cab, took off head and it has had a fair bit of work done such as 3 angled valve seats adjustable tappets, ports are huge, double valve springs etc, need to know if will be any good on a turbo or not due to combustion chamber and valve clearances etc

 

so know one can help then, surely someone out there can help PLEASE

 

The turbo head is the same head as any XR3/XR3i head, so it should fit nicely. You should anyhow investigate the cam, cam wheel, and amount skimmed so you better know what you can use.
BTW, as far as I know, any CVH head has 3 angle valve seats as standard. At least for the inlet side. Of course these still are not race type seats.