Date code on BB Chevy Block

[SS454]

Hi guy doing a little reserch on a BB I picked up. The casting # 3955272. The date code is I-26-8 which I read as Sept 26 1968??? It is a 4 bolt main and has the big plug above the oil filter housing. My question is, is this a block for a 1969 modle year car? Next question is what are these worth. I've seen some pepole asking what seems to be a lot of cash for just a block. This is a complete short block that dose need to be gone though. Spins freely but sat for some time with no heads on it so the deck has alittle surface rust. I've included a few pictures let me know if I missed anything like it's a small block morron Thanks for the help.