There was some stuff on those engines back in the day, but unfortunately they only lasted here in North America for 4 years, 52-55. I understand Kaiser did a few with Mcculloch (?) superchargers for the Darrin, and I've seen a picture with the F161 with 3 carbs on one of the sports cars made on the Henry J chassis. The Excaliber maybe, or the Wildfire? Dunno how they did that with the existing head design. Or hunt up the Hemi head experimental version they did for development of the Tornado.
But Brazil is where you might find parts. That's where the engine went, and they did a bunch of stuff over the years. That's where that twin carb head picture is from, sometime in the 60's. There was at least some versions with a nice looking separate intake manifold and a 2 bbl carb as well. After Ford bought Willys down there they kept the engine all the way into the late 70's and even installed it in the Maverick. I know at one point Ford did a fairly significant rework with a taller deck for the 1/2" stroke, revised cooling (rear cylinder apparently gets hot) and probably integral mounts as well as a full flow oil system. I'd think the later the version the more difficult interchangeability would be. At some point they were all the way up to 140 hp. That would be sort of smoking for 52.
But a mid sixties dual carb head would be real cool.
The engine is really cool - weird is good! and everything I read on it says they were a really nice little engine. I know my Dad's Henry J with the flathead version is excellent, smooth and quiet but not a lot of power. That's why I picked up this F161, trying to convince him we should put it in that or the Jeepster. The 49 Jeepster needs it more, it's got the flathead 4 and that's not much power! 50% more power would be good, but he is not biting - so far.
So - how is your Portuguese?