Firstly, when are you planning to go? If you are going for the 24h race then you will need to consult the appropriate french AIC/notam for slot times etc etc.
Remember also that the weekend always seems to be the (UK) CAA's enforcement branch "day out" and everyone gets ramp checked looking for "dodgy charters" etc so make sure all your paperwork is in order.
If going at some other time you will probably need to book customs 24hrs or so ahead or clear somewhere else (Cherbourg/Deauville/Dinard etc).
Lastly, on my chart a straight line from Le2K to LeMans does not go anywhere near Paris.