Oswald - The block casting# 3836233 matches 1955-57 Chevy 235’s with the low position water pump.
The “F55Y” stand for built at the Flint Plant, 1955 model year and a passenger car 235 original equipped with an automatic (Powerglide) transmission. As such, it would have originally been built with a hydraulic cam and lifters. They can and do get rebuilt with solid cam/lifters as they function fine in the same block.
Your head casting# 3836850 indicates it’s actually a “261” truck engine head. The head date casting codes C 1 2 stands for March 1st, 1962.
Definitely not what was married together at the factory, but could be a very nice engine depending on how it was built.
