The Stovebolt Site Forums The Shop Area Engine Shop Ok, now engine ID help, with pics!

There is also the fact that in an earlier post you said.

"It is a 61 Apache 10, on a 66 c10 chassis."

I assume that to be info that the previous owner gave you.
If you haven't done so already, I'd get the title squared away before going one step farther.

The 66 chassis, jives with the engine # info longbox found.