Mine ('76) did not have the c-clips (I thought these were only post '93). The cylinders are held with two c-plates that interlock and are held in place with a third "sprung" one. I removed the outmost sprung one and then lifted the tags with a pick and pulled out with long nose pilers.
After that quite easy. I used the HoE fitting and rubber boots on reassembly (also re-useable). Much better protection than the Morgan default.
Best tip is do one side at a time and then you can view the other side.
Hub comes off with the four small bolts (do not turn the screws!). May need a sharp tap or two to brake any rust (as if you are hammering it on). Also you may need to wind in the brake adjuster (square peg on the inside of the back plate) - if you turn it the wrong way you can not rotate the wheels).
Did mine for the first time a few weeks ago, all quite straightforward. Remember to adjust the brakes with the square peg on reassembly (or you'll struggle to adjust the handbrake).
Best to connect the springs and then pull the shoes in to the cylinder and adjuster...or that's how I did it.
Hope that this helps,
R.
