Did you try using a screwdriver through the timing gear to lever it up on the cam with the chain on the original link mark? From the picture on the timing marks the grove looks like it might be a little to far to the right, i.e. one tooth off. The "v" notch should just be off to the right with the edges of the notch and groove lining up or maybe over lapping just a little. It has been a while since I did mine, but that is the way I remember it and the manual's picture is the same way. Then again the could be slack and stretch from it being an old chain, but I would think the notch would go more to the left as the chain stretched because the time to change the positions (i.e. advance) the gear is when the notch is to the left of the oblong grove.