Bled the rears today and took it out for a drive, feels loads better.  It's not as sharp as I hoped it would be, but I've never driven a car with 4 drum brakes before, so maybe I'm just expecting too much.  The Ghia (disks on front) was sharper, but that's understandable.  I'll drive it around this week and see how it goes.

Thanks all for your help!