As we are first time owners (October 2007) of an '74 Sovereign
A/S it probably will take awhile to digest the information you have provided and check out further information in the links you have posted.
We've just started into the deep freeze weather of Manitoba so we do have approximately 6 months before the converter problem needs to be corrected!!
It is just so reassuring to know that there are so many forum members who are so willing to get us first timers up and running. No doubt some of us would make costly mistakes if it wasn't for all the kind advice.
Thanks to all,