Engine rebuild

Rebuilding a 172 cu in gas out of a 59 961. trying to identify if its sleeved or not. It's your standard CONN 6015J On the other side of the block by the Cleveland Foundry mark it has what look like 1L10. Is this a date code and if so what it translate to. Also there is a circle with a 5 at 12 o'clock continuing clockwise at 3 o'clock there a 7 at 6 there is a 1 and 9 a 3. what's this. I hopefully attached photos of these markings. Thanks in advance
a223593.jpg

a223594.jpg
 
If the engine oil filter screws directly on the block, it came from the factory without sleeves. If it has an adaptor to make the spin on filter work, it came from the factory with sleeves.
 

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