Send the lifters back and get the 8043-16's. They should have more skirt at the wheel enabling you to "drop them in" and not uncover the oil galleys.
That is the BEST thing you can do!
Everything is used. I bought the top end kit from a fellow racer. Thing is he ran it in a stock/unmodified block for a few years without any problems. I'll have to do some more checking. Thanks.