What's it worth?

Hey guys, I've had a 440 block in my possession for about 8 years, hoping to find a project for it. Now I'm to the point i don't plan on ever using it.

it's a 1973 date code "HP" block, I don't believe it's ever been machined and it has the block, main caps, and I think i have the set of flat-tops that came out of it when I tore it down....

The question is, what do these go for? I read something in Mopar Muscle about HP blocks being sought after, what do you guys think?