[Stefan]

It certainly is a 2 Litre cylinder head, probably an 85C, and has been stripped ie had the valve guides removed. If you put some photographs up of the combustion chamber surfaces we could probably identify the model better and see much better what the condition is and how much meat is left on it..
These do become porous with time, the alloy can crack between cylinders, and also repeated planing of the cylinder head will raise the compression ratio to an unsuitable level.
It is possible to spend, I am told £2000 restoring a bad one of these. Having said that it is certainly very saleable, I suggest contact a couple of the Specialist Bristol workshops or indeed BCL themselves.
Inracing do now make new ones, costing £££.