Ignition boxes - worth it for the effieciencies
I think I have 5 msd 6al.....2 are in use...with one or two as spares...and as said above they go back for repair if needed.....
the one msd 7-2 has been rock solid for many years now...
and I have one msd 6C I bought back in 1979, it still works...must have parts that were made in the USA in that one.