engine stand, mount help please?

[slt0066]

hey can any of you guys tell if one of these frame mounts are for a big block?
my truck originaly had a 6cyl but previous owner installed small block 350 with the mounts on the left . I dont know if he changed mounts or used the factory ones . my ? is are the mounts on the right in pic the correct ones to use for small block or are maybe they are for a big block? and can you even tell just looking at them ? does that make sense hope so thanks