I tightened mine with a hand held nut driver, that is all it needs. I forget the exact spec but it's very low.
I personally never was a fan of RTV on things that shouldn't need it but I've seen it done many times.
The left front might just be the half moon seal that is leaking, they are only a few bucks. The gasket itself may be ok. I would get the entire kit though that way you don't have to worry about it again for many years.
http://www.prostreetonline.com/oem/wiza ... Gasket+Set
Here is a kit with the 4 spark plug seals, 1/2 moon, and gasket itself for < $50 but I don't think it's true OEM.
http://www.trademotion.com/partlocator/ ... atalogid=0
Here is OEM for $40 but it's just the main gasket.