Sorry, I can't help with the clutch/tranny but I am trying to help my neighbor with a Huffy 8. The carb needs a rebuild or replace and I cant find a model number for that Briggs and Stratton 8 that is in it. The mention of the Huffy 8 lead me to this thread. Actually it is a Bradford Monte Carlo (WT Grant house brand) that was a Huffy Monte Carlo re branded for that chain of stores. The carb is only marked A3. Plenty of carbs available but they want the engine model number. It appears that the Monte Carlo was just made in 1971.
I hope I won't get in trouble for being off topic on my first post but I have been looking for two days and coming up dry. Thanks.