The runnig 235 engine and trans I bought out of a junk yard came with 12v starter and generator. I had both of my 6v's rebuilt so as not to mess with the 12v conversion and keep original. There was no issue with flywheel and 6v starter. My issue is no restart after first quick start...but that's another thread to search here.

54 Chevy 3100 Deluxe 3 speed on column. Keeping original as possible but changed to 12 volt system.
JB Weld..."I put that stuff on everything"