Setting the timing

I had to replace the left cylinder head. Marked all the timing marks on the cam shaft bearings, the timing chain, cam bearing caps, and camphors. The arrows on the camphors were a little off. Installed a refurbished head with valves, cams, etc. Lined up the timing marks on the cams, cam bearing caps, timing chain and camphors. All lined up perfectly except for the arrows.
They are approx. A 1/4 " off.

Question 1. Is it necessary for the arrows to be perfectly lined up if all the other marks are?

Question 2. How do I line them up without messing up the other marks? Will I have to release the tension on the timing chain to do it?

Thanks