Looks like you need the pump that I was suggesting that Milodon should build. You already have an inlet in the block so you don't need a pump with the inlet on it. That would shorten the assembly by 3/4 of an inch which would probably allow things to fit together.

It isn't a tough project to do, just takes money. The other option (which would be much easier) would be to switch over to a factory Hemi oil pump body.