Gdads51,
I was editing my previous post and did no see yours. Thank you. The head does read 3836848, I wrote it wrong.

In the edit I anotated what I thought the #s ment

For some reason I got the "I" in I29 in my head as a lowercase L. So thought it was a Dec code.

I found on this site.

http://www.1954advance-design.com/Stovebolt-engine/casting-numbers.html

That 3769716 was in trucks from 58-62 and in cars 61-62. Of course It may not have all the data.

Now I know I will need a shop manual for a 59-62 car.

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