I found a better photo of the head and was able to zoom into the casting number.

Head casting 3886850
OR. 3836850

to me the third number looks more like a poorly cast 8 than a 3.


See attached.
Attachments
20230716_161633.jpg (59.42 KB, 48 downloads)


Rock49 aka C-Rodg
work in progress
1956 Chevy 3100
261 engine