late 80s 360 cam choice

Personally I'd call Hughes or Comp, I know both have cams for the factory hyd. roller. A flat tappet will work, but the pushrods are too short, and the rockers don't have oil holes on the top of the pushrod socket area. Don't fret custom order pushrods with oil holes (aka Chevy, Ford style) will solve both problems. 7.5" should be the length for flat tappet cam pushrods.