previous pro3 was a pretty good mobo esp for its price. so i think yeah you could oc.
are you planning on buying or is it what you have now? if you have it already, just check the bios to see what you can do.
if you are not familiar yet with oc'ing i suggest you read some guides first.
if you are familar then start crunching
i have extreme4 (z68) and i remember pro3 as one of my choices back then