OK guys, it's been a very long day.
I drove back to the truck to extract some parts for a buddy and try to verify what I had.

The block casting number is 3769925

Hey Tim, I still couldn't see the stamping on the pad but I sure TRIED

I'm thinking 261, 58-62 grin

Jerry

1959 Chevy Apache 3200 Stepside
In the Stovebolt Gallery
Restoration Journal on Facebook

"A government that robs Peter to pay Paul can always depend on the support of Paul." ~ George Bernard Shaw