Best thing you can do is go to this document and look over the pics of the dowel pin that governs if you have full flow or bypass. Very important distinction because if you use the wrong one you can starve the bearings.
http://devestechnet.com/Home/TheVenerable261Lots of great information there about your engine. It appears it's set up for bypass. We know because the front outlet is not connected to the rear inlet. They must be connected together if the dowel is pushed in. Knowing that, you can go for any bypass system you want to use, or change it over to a full flow oiler.
