Do NOT fill the lifters with oil!!
Most lifters have a plunger travel in the order of .200inch. And if you have non-adjustable arms, during the valve gear install,your pushrods are supposed to depress that plunger to around half of that. If this does not happen due to a hydraulic lock in the lifters; you may be driving your valves straight into the piston crowns.
But even if you have enough PV clearance, the valves will not fully close and your compression could be as little as nothing. So during the initial start-up that extremely low-compression engine will crank and crank and crank, throwing all the cam break-in paste off. And if you're not figuring it out, you will tear your hair out. Then when it finally does start, with little or no break-in lube left on the lobes....... who knows what lobes will survive.
Leave the lifters empty, but make sure they spin freely.
Mopar LAs have to be primed with the cam in two specific orientations so that oil will go up to the top-end and fill the Rocker-shafts.One position for the passenger side and a different position for the driver's side. During this procedure, the lifters will get pretty much filled also.
Break the cam/lifters in, then worry about clatter and lifter rotation.