My siblings and I are looking to restore my dads whizzer for his 60th birthday. Problem is none of us know a whole lot about this bike. Could anybody tell me the year of this bike? Also a good place for parts? I found 2 motors in my dads garage with one being a "J" motor and the other being an "H" motor. Both likely need rebuilt and was curious if one would be better to rebuild than the other. Any and all help would be greatly appreciated.