I assume you mean the DownEaster 38, designed by Henry Morschladt and built by Down East Yachts in Santa Ana, CA. This is a heavy displacement cruising boat...19,500lbs displacement on a 29' waterline, and 8,000lbs internal ballast.
I'm no naval architect, but I doubt seriously if the F-P generator installed in the engine room would make any difference at all, other than provide more ballast low down. It would be like carrying an extra crew member, crouched in the engine room :-))
BTW, I've heard that F-P has overcome some of their earlier problems, and they have an aggressive and very supportive U.S. rep. This is a good thing. Again, I assume you are talking about a NEW F-P generator.
If not, you might want to consider another one, such as the NextGen 3.5 or 5.0KW models which are built on Kubota engines and are very robust (I have a 3.5KW model).
S/V Born Free