pushrods with or without oiling hole?

I think I read the question right.. the answer is no. If you use the right lifter (which is what 1Wild is saying) the top end will have much more oil available because the stock system only oils the rockers when the holes in the cam connect the passages in the block, and only for a few degrees of rotation where "thru the lifters" oils 100% of the time. You should not see a drop in indicated pressure either.