I have reached the point of decision regarding the timing chains and all that good stuff at the front there. I am not building a racing car, just trying to do what is right for the car.
It is a rather low engine XJ6 S2 engine and on disassembly the tensioner seemed to be in good shape with only a narrow gap from its base.
Is the established wisdom to:
1- If it aint obviously damaged keep it all (chains, sprockets, tensioners etc.) , cost $0
2- Absolutely replace everything (including sprockets) now since you are in there, modern aftermarlet parts are better/quieter/longer lasting, cost $700
3- Replace chains and guides just vecause , cost $100
4- Other… hours of measuring…