Priming motor question

So I am moving along on putting my 526" together and started to prime the oiling yesterday. I ran the drill and primed until I was able to confirm oil to one head, then rotated the engine until the second head oiled as well. The problem is I never had any oil come from the pushrod ball ends. I am using MRL/BAM's oil-thru solid roller lifters (confirmed as oil-thru) and Trend oil-thru pushrods with ball-ball ends (to go with the cup adjusters on my rockers). I have confirmed there is tons of oil leaking/coming out of the lifter bores so I know the oil is there. How long does it take to get to the cup? I am guessing it gets fed at a different time in the engine rotation cycle because of where the oil band is in the lifter. I have tried to run the drill while constantly turning the engine over by hand but then I keep overflowing the oil on the headers. Any ideas?