273 HEAD GASKETS

If anyone actually knows of a 273 head gasket with the correct bore diameter other than special order, really expensive, Cometic gaskets please speak up. My understanding is that you have to use a 318 gasket now-days on a 273 because they no longer make 273 gaskets other than really expensive special order . I am building a bone stock 273 and would love a cost effective 273 size gasket but can't find one.
Thanks.