Looks stock to me.
I say go ahead & build it.
What are your plans for the build?
MBHD
Probably not much more than stock (sorry-I posted this in the H/P section by mistake)
I will be needing a replacement for the 250 in my '68 C-10 at some point. It still runs great, but is starting to use a little oil. I like to have another ready to go when the time comes. But on the other hand, it would be fun to juice it up a little. It's just so hard to find good blocks that ain't already 40 or 60 over. I suppose I'll go ahead and pull it out and make sure.
