I would caution the 30-35 engines available today are much lighter weight than any of the common engines when that plane was designed. Byron planes can be tail heavy anyway so I'd still be tempted to put a heavier (read that more power) engine up front rather than having to add dead weight for balance. Certainly the 30-35 engines will get in the air but I can't imagine the experience being a pleasant one. That is a fairly large airplane that can build heavy.