According to this thread here, you might have around 40+A on the 12v rail.http://www.tomshardware.com/forum/273649-28-litepower-700w-5770-q9400
Lets say 42A. 42A * 12V = 504W. Let's assume you have a 95W CPU and take away 50W more for the board, drivees, etc and that leaves you with around 350W for your GPUs. The TDP of the 560TI is officially 170W, so 340W is needed for SLI.
So yes, technically you have enough power. What delluser didn't say in that power however that 65% efficient PSUs, and those that don't clearly state how much power is on the 12V rail shouldn't be used. Period. More so if this is a many years old PSU that you've been carrying over from build to build. Retire it, get a new one. If it did work, it won't for long.