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I merged these topics as it appears to be the same subject.10243880:Date: 1995-1999 350, 4 bolt, crate engines and ZZ4, roller cam, one piece rear sealIt could also be a L31 Vortec, but the L31 would have 906 or 062 heads.Based on it being in a 1993 it has been replaced. You say is has 191 or 193 heads, which one, casting should be under the valve cover. If they are 193 heads it is a 1995-97 Vortec.