It's probably semantics, but your motor is a McCulloch, not a Scott. McCulloch bought Scott-Atwater in '56 and all motors where labeled McCulloch by 1964.

I believe the original part number for the Phelon coil was FG4128.

Here is an untested magneto assembly for sale from a 1967 14hp motor:

http://www.thebrazilianconnection.com/67mc14parts.html

Have you tested your coils yet? the coil should test between 40 and 55K ohms.
If it tests good, cracked coils can be covered in epoxy to seal them.

Old Outboard Jim sells phelon coils:
http://aomci.org/forum/viewtopic.php?f=3&t=2898

Jim Judkins, Member: AOMCI
715-294-2940 (evenings & weekends)
oldoutboardjim@hotmail.com