Maybe this is well known but maybe not. The flat head Chrysler six flywheels fit the early hemi’s. They only have holes for 6 studs but they are in the right orientation to fit. They are much lighter than the Hemi flywheels. They run about 20 lbs vs Hemi ones at 30 and up. I cut a Hemi flywheel down to 20 lbs and later saw a 6 flywheel and found that it fit and was the same weight as my modified wheel.
The pattern is symmetrical. The ring gear is the same. The offset hole is the same. It was balanced on the flathead. I put it on my 241 and it fit perfectly. I really saw no differences between the 6 and the cut hemi.
So the primary difference between 6 and V8 appears to be thickness then? That would make sense, the V8 has more torque, and the cars weighed more, so the thicker flywheel handles the heat buildup better than the thinner 6. Obviously, putting a Hemi in a light hot rod means that thick flywheel isn't necessarily needed anymore, but a lighter flywheel on a 331/354/392 is kinda irrelevant, since all your torque is down low, and the need for a fast-revving engine isn't as critical.
You are right. I have one with the late Hemi ring gear. If you find one with the early gear, you would need to change it.
4, 6, & 8 bolt Chrysler flywheels are all the same pattern. One could also drill the additional holes for higher horsepower engines. Dave
Years back I did a step by step on installing all 340-360 parts. Same as I have in this bolt together unit. Very Few ever use the search menu here, so I gave up making any postings. Maybe a few comments trying to just give a little help instead of spending hours (for me) doing how to posts. It's like the Never Ending "my Brakes don't work" posts that show up continually.
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