just got the blocK# 3769717 and head# 3836850. what is this from? and has head been changed?
The 261 block casting is from 1960-62 and had the front center mount.
The 261 head casting was used from 1954-62.
From 1954-57 the 261 also used head casting 3703570.
There should be some date codes on the block and head.
