push rod ?
Mopar has been cursed by their lifter geometry. It sucks. It is what it is and cant be changed by your average Joe. Your lifters have holes in them because they also fit AMC/Magnums and they oil through the lifter, up the hollow pushrods to the rocker arms. Most LA's dont oil through the pushrod, their rockers get it from the shafts they ride on. Pedestal Magnum rockers get oiled though their hollow rods. Looks good, run it.
That is a lifter valley baffle. The holes are for spring steel clips that rotate under the head lip to keep it down. You need those to keep it in. It holds the oil flung off the camshaft off the intake bottom and also keeps your lifters in place if you pop a pushrod, preserving your oil pressure. Ill post a pic of one with the right clips.