How do I decipher the engine code on my 360/727

yea that I knew... however we tucked the engine in the corner of the garage, and I really didnt feel like pulling it back out to check out the passenger side.. plus its pretty grimy and in need of some degreasing.. lol.. I was more interested in the numbers stamped in the block in the front (right below the drivers side head) trying to figure out what those meant