The offset key required will be 1/2 the degrees the alignment of crank was from TDC . So, you would want the .9mm key [[3/20' degree] for a correction @ crank of 6-1/2 degrees - part #621-991-02-67.
If the head has been cut , don't expect a new chain to bring the crank/cam back into alignment.

__________________
A Dalton