I run the MP housing and high volume pump with anti cavitation plate... purchased a while ago. The combo works great. The MP pump has gotten very expensive or not available. Done again, I would go with the Mancini setup.

As far as the housing... there may be differences but I do not think the outlet size is an issue now with the 440 Source offering.

On pumps, there are differences that matter. The simple vane type pump with anti-cav plate run at least a little faster than crank speed works well for me (and others). The sexy scroll type pumps not so much from what I have seen.