Mine came from a motorhome as well but I have the stock Gen VI oil pan. You switched to a stock Mark IV pan?
Motorhome was MarkIV era, engine was replaced with a Goodwrench crate at some point. So I'm assuming here that it's the MarkIV pan, though seeing how it was a GenV service replacement it could be a GenV pan come to think of it. With the block being GenVI, I figure it was purchased after the horrible GenV was discontinued. It's quite the mish mash, but it's all bolted in there with ample clearance.