Maybe no one cares???
I do know that there are several patterns of holes punched in head gaskets.I ran into this 10 years ago on a 261 Chevy .I never got a straight answer on which gasket is is the correct one to use.
I have two early 70's Chevrolet factory parts manuals.Both the 235 and 261 were out of production by this time Only one head gasket part number is listed for the 235 ,#3709428. And one part number for 261,#3836963.Must be GM felt these were the gaskets to use..
So maybe you can find these gaskets on Ebay,buy them ,see how they match the head and block.
