To follow on to Mitch’s comment, the aerodynamics that were done to make the “J” can be done much, much better today. Yes, all the Mooneys can be made faster and more efficient with today’s knowledge/CFD.
I look up to and highly respect Al and Art Mooney, Ralph Harmon (the real designer of the unbreakable, metalized Mooney wing) and Roy LoPresti, but we know a lot more now. And yes, despite all the generally negative comments about the younger generations, have brilliant minds today, too. :)
PS. Mitch: The “Ovation” would be a great one to start with ... both faster and lighter (=> more useful load).