I too have both engines. Converted to CH Synchrospark ignition and equipped with a BCM wrap-around Pitts, my Fuji 64 turns a Zinger Pro 22x10 at about 7000rpm on the bench after maybe 1/2hr of running. I am sure it will get better as it breaks in some more.

I have had G-62s before, but the latest one I just got in has the large volume muffler. It has two stingers pointing straight down (engine inverted) very near the cyl head. It also has a third support point in addition to the two through bolts. This one is in the process of getting converted to CH Synchrospark as well. I just have to time the hall sensor and it'll be ready to fire up.

One immediate observation is that, AFTER EIS conversion, the Fuji is considerably lighter than the G-62. With the BCM Wrap-around Pitts, which is fairly heavy, the Fuji weighs right around 5lbs without the ignition module. The G-62, converted to CH ign and with the stock muffler weighs 5lbs 10 Oz. The G-62 does have the external ign coil, so the difference is maybe 2 Oz less. Still, that's 1/2lbs difference.

I will reserve my judgement after I put a Pitts muffler on the G-62 and run it on the bench. Still, the legendary reliability of the G-62 is hard to beat. I know these days the talk is all about the sexy and svelte DAs and ZDZs, but I just have a soft spot for these humble industrial engines.