Pan/pick up...
Usually, the pan and pick up are pretty much a set... Using the wrong, or wrong type, pick up can result in a reduction in efficiency... I will suggest you stay away from the Milodon re boxed oil pumps... The last ones I inspected were, lets say, less than stellar... AND, they're just re boxed off the shelve stocker Mellings with really shitty quality control when it comes to the numbers inside...
For a "pleasure" boat engine I would recommend the Mellings 10778. It'll do everything it needs to do. For an all out racer, I'd go with the 10778C which has the reliefs in the housing for sustained high RPM use...BUT, the "C" is NOT recommended for engines that idle a lot as they WILL see lower pressures at low RPMs, like 5 MPH, no wake zones....
The Milodon pick up will fit either of those Mellings pumps..
Ray
PS Any pick up you choose to use should have a welded bracket to bolt to the pump. DO NOT try to braze or weld a pick up tube in an expensive pump. It will distort the housing no matter how careful you are..And yeah, I know, we did it for years...