Looking for Information on my 4.3. Just purchased a 94 Monterey 190 SCR with a 4.3 LX ( SN 0F148067) with 330 hrs. After speaking to Mercruiser the engine was manufactured in 93. But it has Vortec head Covers, an 8 bolt intake manifold and a ribbed aluminum oil pan. Didn’t the 93s have the 12...