Thanks again for all your help. The Napa drum looks to be the same as the Raybestos 2067 at 3.55 high. The drum I have is 3" high so one or the other should work providing there is no interference with my existing backing plate. I'm trying to find one locally to have a look at it but am also heading for the wreckers on Friday to look at backing plates to see if I can go that route. If I can adapt a backing plate it will also help with using the standard Chevy park brake cable.
I'll keep you posted.
