i got a 360 with a 40 over bore.....

i got a 360 with a 40 over bore.....

i got a 360 with a 40 bore..... and cant seem to find the right head gaskets. Can i use 60'' bore gaskets on a 40'' bore? i have the MLS type of gaskets now and they leak water all over the place grrrrrr. dont like them at all... i looked on summit and mancini and nothin.... can someone show me the light....