I have a 91 D150 with a 318 and I want to put on a Mopar air cleaner to match the valve covers and called to to place an order. Asked about attaching oil breather hose to air cleaner like stock one and was told that there is no attachment and no knockout to attach one. Any thoughts as to what to do with hose? Remove it from oil breather or plug it up?

 

Don't plug it up, crankcase has to breath. Just put a breather filter on it like this:

http://www.ebay.com/itm/9MM-OIL-CRANKCASE-VALVE-VENT-CONE-YELLOW-AIR-INTAKE-RUBBER-FILTER-BREATHER-CLAMP-/151273974371?hash=item2338a1aa63&vxp=mtr
Or a catch can:

http://www.ebay.com/itm/Universal-Billet-Aluminum-Cylinder-Oil-Catch-Reservoir-Tank-Can-Breather-Kit-BU-/151657321430?hash=item234f7b13d6&vxp=mtr#ht_2485wt_917

 

Thanks looking into a breather.