Good question. I didn't even notice that. The block is sitting upside down on a rack behind 4 crankshafts now. Pulling it out is a PITA so I probably won't unless somebody is really interested in it or I decide to use it for something. I have way more engines than bodies for them at this...
I just got this 340 in a trade. I figured I would see if someone is looking for their original engine. It’s going on the shelf for the time being. I don’t really have a use for it and it is for sale but I would love to get it to the car it came in if possible.
I highly doubt these are marine blocks. The guy raced them for years. They have flash rust on them from where the tarp blew off during a storm just before I picked them up. Machine work was done by Hensley Racing in Knoxville. They didn’t work on crap.