1986
Google the vin that's on the block
what year is a 350 block with the stamp GM8970010
It is an excellent GM block.
a 454 block
on the block
350 cu/in block used in GM Goodwrench Crate Motor. Made in Mexico.
Check out this site, http://www.nastyz28.com/sbchevy/sblock.php
350
Yes, they are very different.
how much is it worth
usually