What? An rb30 block doesn't have a heat exchanger on the oil filter, no need to change anything.
The oil feed is on the exhaust side of the block on the correct rb30 blocks. And the return goes to the heaps obvious spot on the block.
Just connect the lines together.
I've noticed you have started a lot of threads asking for help with your build, just a suggestion but why not just use your build thread for it? You will still get the help you need,and it won't be spread all over the place.