So I'm pretty sure that a new chain is the best answer, however I do not have the money for this at the moment (I'm currently working on the front suspension, ball joints etc...).

As a temporary fix/improvement I would like to install a woodruff key to bring the timing closer to spec.

Assuming a woodruff key has never been previously installed (I know the PO and i'm 99% it hasn't), are the woodruff keys sold here at peachparts a 1:1 match for the reading I have taken early in this thread?

i.e. if I am showing 5 degrees off is the correct key the 5 degree woodruff key?