Kevin
Honestly....no. I had access to a large rebuilding shop at Poplar Grove. Went in and the manager of the engine rebuild shop (Dave Mitock) helped me weigh a bunch of cases. There is definite creep over the years. The older cases (1950's stuff) was pretty light and they got progressively heavier over the years with the newest ones being close to 7 pounds heavier than the older ones. Unfortunately I lost that notebook so I don't have all the specific weights. I do remember that the narrow deck with the thru bolts and banana plates, was heavier than the wide deck (with the appropriate case bolts). Also the mid 60's wide deck case was the lightest. There was no significant weight difference on cylinders that had the tapered fins. The hollow crank was quite a bit lighter than the solid, and also allows the flexibility to go Constant speed prop in the future if you so desire.
Now.....if you add light weight Emags, Magnesium sump and flywheel, B&C case mounted alternator, light starter, (conical case obviously) no swing out mounts, built in thrust line, composite prop,............ you are way lighter with a 0-360 than the original 0-320 set up.
The carb for the 0-360 Vs the 0-320 is about 2.5 pounds heavier. Big difference there and a good throttle body type set up (if there was one) could be a significant weight savings. But all my research so far has not really been so positive in that area. There seems to be some success with smaller Rotax, Jabariu, type engines but almost no one in the RV group is running throttle body carbs. Why? If they really worked everyone would be doing it, kinda like the Pmag is getting VERY common. Just my opinions and all that folks. Sorry I no longer have all the exact weights to share to document this. Perhaps I will go back sometime and spend a day reweighing everything to get those numbers. I know exactly when and where I lost that notebook. That sucked. I had a ton of info there.
Hope this helps
Bill