Oil filter plate

Sorry guys not sure of the name of the part.But its the fastener the holds the oil filter plate to the block that the oil filter spinns on.Well after priming the 360 I found a leak were that large round gasket is.So I got a new gasket,got out an 1 inch socket,the builder must of used lock tight cause I can get it to budge but whats worse I have rounded it some, now my socket wont grab.How in the hell am I going to get it off.If I left it alone it sure would be a leak at that gasket.I have a buddy thats going to see what he can do,its on my engine stand.Any tips I am lost,there is no way to put this new 360 in,it will leak there forsure.:angry7:OOO so close again.On the bright side i got my new oil pan on tonight.