whats a slant 6 worth ?

I donated my slant, it's 904 and the 7 1/4 to the local high school auto shop, and got a $400 charitable donation receipt. Win-win for everyone.
That's a really good way to get the next generation involved with or at least aware of how it used to be. I donated a GM 3.3 V6 and transaxle to a local school years ago when I was moving and had no place to keep it.