I am running a stage 1 block with a 3.625 stroke. so the block must be clearanced for the stroke, Which entails chopping into the factory internal oil feed, But with splayed 4 bolt center caps there is not much room for it anyhow. So that is a duttweiler (lee thompson oil pump that pulls oil from the outside of the oil pan on the bottom. Will take closer pics so you can see it better.THe other hose you see is the oil pump bypass which is adjustable for pressure and return oil thru the fuel pump block off plate.