need help in decipering these engine id numbers

[kevinw]

thanks for the info. what is T 13 and 37 TG 14? so, you have seen where one digit does not line up as rest of the vin? I also see these little stamp clock like stamps, with an arrow in the block, what are those? so this engine is a 2 bolt main.

I assume getting this rebuilt still adds value to the car as opposed to just doing a crate engine? this rebuild is taking forever, now they have to bore the block area where the crank goes, as it don't turn freely