Jack,

There were a variety of GM and non-GM oil filter assemblies and different mounting set-ups. If you can post a link to a photo of the filter mounting bracket the advice you receive will be more helpful to you.

The oil filter canister on Chevrolet 6-cylinders were usually mounted on the manifold side of the block, with the mounting bracket attached to the intake manifold with u-bolts.

A variety of mounting instructions are shown in this Tech Tip for AC/GM oil filters.