Road is now the D981 according to ViaMichelin.
A good east/west route between the Loire and Rhone valleys. Once out of Nevers and through Imphy (bypass under construction summer 08), the road opens out into an average rural French D road to Decize. Stop in Decize for refreshments by the canal or either of the 2 rivers (Aron & Loire). Your best to get onto the one way system and then cross the long bridge over the old dry river (signposted Moulins) for the town centre proper, shops and cafes. Alternatively carry on round to the left and out of town towards Autun.
The road from Decize opens out with fast straight sections between open bends. Theres a few crests and junctions between Fours and Luzy where you might be advised to stick to the speed limit but otherwise its a good surface and not very busy (unless theres a big race on at Magny Cours). Luzy to Autun is more of the same really, quick, quiet, uncomplicated French D-roads (ex N-road) with nice views of the Morvan National Park and Mont Beuvray to the left - plenty of local lanes lead off up into the hills if you fancy a detour.
A lovely and still largely unspoilt part of the world.