The 430 SE was built so it runs right no matter which of its three power choices you opt for. In addition to the quadruple outboards powering my test boat, you can elect Volvo Penta's IPS or choose conventional shaft inboards. Each choice changes the boat's center of gravity (CG). To handle this, a sizable boat is required, such as the 430 SE. It must have enough hull bottom to handle the weight shift between, say, outboards on a bracket and inboards mounted in the bilge. If you order IPS, the engines sit directly in the CG. Placing weight on the CG has no effect on fore-and-aft trim. Order inboards or IPS, and SeaVee uses a different mold that pushes the transom wall aft, moving its weight with it (plus giving you a 2' longer cockpit).
Each power option also has different requirements for water flowing off the hull to feed the props. If you were to see all three iterations of the 430 SE out of the water, side-by-side, you would need a keen eye to be able to see the subtle differences. Suffice to say that, just like the cockpit mold, by using mold inserts, or "modular tooling," SeaVee ensures the wheels get the water they need at all speeds, regardless of power. I haven't run the other versions of the 430 SE yet, but I did run a pair of SeaVee 390s, one powered with IPS and the other with outboards, and both boats ran fine. So SeaVee has proved to me that they know how to do this.