Here you go....the holes to add on an 848 head for a 261

http://i140.photobucket.com/albums/r19/LutherParris/1950%20Chevy%20Coupe/Enginepictures011.jpg

http://i140.photobucket.com/albums/r19/LutherParris/1950%20Chevy%20Coupe/Enginepictures010.jpg

I'll have to check my notes for the angle but from memory it seems it was 12 or 13 degrees. That is so the hole you drill hit in the water passage. without the angle there is a chance on a couple holes that you hit the side of the water passage and not the center where it will flow good.

...this is from memory guys. I don't have my notes handy.

1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile