The truck motor mount bracket, does it matter if it's from a small block or a big block? The thick motor mount from a/6 duster does it matter what year? I think that the article said that the truck mount was for a '72 - '90. I'm rethinking a /6 car since the motor mount problem has been taken care of. I believe a friend of mine has a 8 1/4" that he put a posi unit in it along with a 3.55 gear ratio.