Been reading here and all over for a while, it appears I have an uncommon block.  Motor is in 56 Customline 2 door sedan which was born in Long Beach as a six cylinder.  I have no information on how this block came to be in this car.  I read more than post and certainly appreciate this forum for the knowledge and advise shared.  I'll make this post short as an introduction, took about twenty blind attempts with the camera but did get this image. 

Ted

Ted, Redding, CA