Hotrod Lincoln,
The head casting numbers are 3836848. The engine serial number is F0419JC. The block date casting code is D171. I believe that last one means it was cast on April 17, 1956 (the 1 standing for the first year of that particular line of 56-62).
I couldn't see the block casting code very well last night. I'll attempt to locate and read that today. With all that info, can we say it is a 1956 235?
***Update*** So... the engine casting numbers are 3769716. I'm a little confused now! Based upon all the numbers I have and following the website below I am thinking I have a 1958 235. I am not sure what the last 1 stands for in the block date casting code. Any help would be appreciated.
http://devestechnet.com/Home/CastingNumbers