I couldnt get to it to read it so I took some plumbers putty and came up with an imprint that read

http://i387.photobucket.com/albums/...ore%2066%20pics/DSC_0067_zps9d9afba6.jpg

22GM <---the 22 was turned sideways next to the GM

then the number

3970010

would the cast date code get me closer to knowing year and what this engine was from?