this is about the best (specific) instructions I can find to rehone the cylinders:
https://cdn.shopify.com/s/files/1/14...structions.pdf
I think whether you use the stones they list or not depends on how bad your cylinder walls are. If they are just lightly scratched/scuffed, just the honing paste will probably be enough.
This is also informative on the whole process of alusil blocks (and similar alloys):
https://www.sunnen.com/NewsDetails.aspx?NewsID=11