Steve:
You may have a 235 head gasket. When I rebuilt my 261, the "extra" holes were already in the head gasket. I had to drill out the corresponding holes in the 235 "848" head. I think the 261 head gasket is different. Others may remember this with more clarity. I also remember a 261 rebuild article, either on this site's tech tips or the Inliners site. The article I believe talks about the extra holes.