Roughly you are going from N64 to N60 so what MJ is saying is measure around N62 using the W010 meridian as good practice.
This is a Lamberts chart and scale is ONLY correct at the 2 standard parallels which might not even be actually on the chart. On a Lamberts whether you measure at N62 or N55 (if possible) would not make a fat lot of difference.
However, if you were ever to plot on a Mercator (not in JAA) it is VITAL you measure distance using scale mid-way along a track, there would be a BIG difference in using scale at say N40 for a flight around N20.
If you follow my original post calculations aren't even required.