If you want to ID the engine, here are locations of the codes.

Post the following if you want to ID the engine:
- block casting code
- block date casting code
- head casting code
- head date casting code
- engine serial number

An Internet search might show your block casting code 3835849 being used from 1942-1953. Most show it for 1952-53 216 block.

If you want to know the date of the transmission, post the transmission code: the location and interpretation for 1947 is given here (same link as I gave above - look at the bottom of the link/page for the location)