In a perfect world, you would have a naval architect measure weight proportions as it currently stands, then apply the changes in weight distribution with the new and exact pod style and outboards. Then you could have a decent shot knowing what mods to ballast, etc maybe required to get the balance you're after. This applies for when the vessel is at rest; how it preforms at speed is easier to manage as you can toy with trimtabs, etc and add a jack plate or adjust the height of the outboard to get the performance you are after.
Sounds like a cool project and there must be tons of these conversions out there in sfbc land, I am sure there will be lots of valuable input. Cheers