That area has the thinest surface for the gasket--It is also an area that is most likely to be mis formed in the oil pan--Now add the fact that for stroker clearance it is probably machined away fro rod clearance and that the oil slung off the rotating assy hits right at that spot------------

It isn't the oil gallery thats the problem--that is entirely behind that bolt hole----You will need to remove the pan to check it out but most likely a new gasket will solve it---and get the strps that go under the bolts----they add a lot of support---