I replaced the entire YJ Golden Eagle pump in my Charger with one with an Energizer kit and a place diverter last spring. On THAT pump, I can say it was a huge difference and well worth it. I don't see the boat much these days, my buds always have it out, but we ARE planning to bring it for the "Father's Day No Skirts" gathering in June at Big River. Mostly, because it's ugly, can't hurt it, and we've added a new droop and wedge to it so we can offer some complimentary bridge washings with a 455 Olds.............
As far as the WJ, had a few apart here recently, and in all honesty, very much resemble a Berk inside. Different Impeller codes, a B is a A, and so on, but can be made as they are to run HARD! Crewcheif's boat is a good example! (Did you ever put that new intake on Keith??)
Unless you're splitting hairs, racing, need aftermarket parts, etc, I don't see the benefit justifying the expense, myself. I think well before I would go that expensive route, I would re-rig the boat with a Berk which would probably be the same cost or less..............

Ray