Dont know the block number (I'll check if I can find it....not much room in there to look around.....er.....where is it located?). I do have the engine model number, 02608344 and the engine seerial number 6774526, but I'm fairly certain they are both Mercruiser numbers.
The Mercruiser parts list show both oil pans, but you have two know which type rear seal to order. To top it off, Mercrusier discontinued both pans, but Seirra sells an aftermarket of either type. None of the oil pan pics showed enough detail for me to use to ensure which pan I currently have.
But I agree it's probably a 2-piece seal. Just looking for "extra info" to confirm 100%.
Thank-you all for your replies. Sure faster getting a reply on a SBC than a Ford FE......LOL.