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Assetto Corsa needs DirectX 10.1 – so you need a DirectX 10.1 compatible graphics card and Windows Vista at least. (There is no DX10.1 in Win XP – at least not officially (AFAIK, it can be 'hacked').)
But...
Project CARS needs only DirectX 9 – so it even runs on Windows XP.
So you're OK in this respect but your graphics card is probably a bit slow for Project CARS, although I think it will run it. On the other hand GTX 660 is maybe too powerful for your CPU – it could be 'bottlenecked' by it, but I am not sure about this. (you could overclock your CPU, AFAIK Q6600 is capable of clocks about 4GHz – but this is rather for advanced users)
AGP is an older slot and I'm almost 100% sure you have PCI-Express (PCI-E). There are several versions of PCI-E but all of them are backward compatible, so you'll be OK.
BTW There is no REALLY SIGNIFICANT difference between DX9, 10 or 11. The different look of AC and pCARS is down to their engines, not because of different DirectX versions. pCARS looks great, but I think AC in some areas looks just as good.
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