<VV> '64 flywheel, clutch kit in '63 Monza Spyder

[Bill Meglen]

Split the bellhousing/transaxle on my 1963 Monza Spyder to discover 
shards of the facing (all of it) on the clutch disk throughout the 
housing. Received a new Dale recessed flywheel, disc, and pressure 
plate, replaced the pilot bushing. no evidence of fluids in bell 
housing. The steel split ring in the differential snout was absent, but 
the seal was intact.  Expect the missing split ring retainer 
over-night. The shaft appears straight but presume the split ring 
served a purpose so will not reassemble without it.

My "books" suggest that upgrade to the 64 or later recessed 
flywheel/clutch is desirable, but am confused by seemingly conflicting 
opinions as to whether it is necessary to replace or modify the ball 
stud for the clutch fork to accomodate the later flywheel/clutch 
combination. The vendor suggests that "you can get by with" the 63 ball 
stud...I don't sense great confidence in this opinion?  Seeking advise?

Bill