MOPAR RACE BLOCK OIL RETURN
Is that the one for sale here on FABO?
Some of those blocks were dry sump only stuff. I *THINK* you can make them wet sump with out too much work.
I'll look later today and see if I can find my R block paper work and see what it says. Even with a wet sump I wouldn't do anything to the lifter valley. The oil will find its way back.