There are a few things on an FE that can keep oil from reaching the rockers, the most common is leaving the galley plug behind the distributor out. I'd remove the valve covers and rocker assys then pre oil the engine to see if your getting oil to the heads, it will come pouring out a passage right next to the second or third rocker shaft bolt, (depending on which side of the engine), remember the drill spins counterclockwise. If not, use just the shaft of the pre oiler (some have an aluminum guide that drops in the distributer hole) and pre oil the motor while looking between the pre oiler shaft and the block down inside the distributor hole. If you see oil pouring out someone forgot the
galley plug...