http://www.stovebolt.com/ubbthreads/...=443230&page=1
This guy had the same casting numbers, and the engine was a 235. However the crank and cam were 216, so his may have been bored out.
Here is a link to the page which showed some MR serial numbers back in 1935:
http://www.gregwapling.com/hotrod/ch...dian-chev.html
On that page it shows the 839253 block casting. Not being a chevy man myself, maybe you can decipher what the page is trying to say.