Did that. thru my machinist the aftermarket price for those Bi-directional rings is $65.58 per hole plus S&H etc etc.
65.58x4= 262.32 so say $275 for just rings.. and still need gaskets, The upper set with head gasket is anywhere from 80-150, lower set about the same.
Adds up to the cost of a kit quick.
Time to throw the old green canvas army tarp over it again for a while and work on a different job for a bit..