Got my 350 powered jet boat running but now have a bad ignition module.  I have an old one from a prior identical Pertronix small HEI distributer.  I want to carry a spare but have not been able to find an 8 pin module with the built in 20 degree advance.  The two modules I have are marked with different numbers.  Nothing comes up doing an internet search.  Anyone know which is the model number on this?  Who sells replacements?