Just wanted to ad this tidbot since it is a Mopar site. I think if you run a typical Mopar style deal, meaning Milodon pump, stockish pan and typical windage tray that you likely would see a definite gain in HP going to a dry sump. The better the wet sump system the smaller the gain will be.

I have witnessed a very strong running SB 2.2(1006hp)go from an external wet sump to a dry sump and gain nothing. Just saying....