Hello, Chris,

I forget what year your engine is, but it looks like a 58-63 full-flow oil system (the hose ports look to be 1/2" NPT).

We have not heard from ElCid93 regarding what year 261 he has. If it is a 54-57, he'll have to either use an original by-pass system (mounted on the intake manifold or elsewhere), or he could use a more modern remote set-up (with a filter head like yours and mine) but he would have to put a flow-restrictor in the input line, even if he uses a narrower diameter hose.

Here is another photo of full-flow filter mounted on the firewall.

Here is the original manifold-mounted full-flow canister on a 1958 engine.

Here is a remote filter head mounted low on the rear of the block (same full-flow 1960 engine as shown above).