I have the FSM which would cover the 78, but it isn't super-helpful. Basically a couple of exploded views. I have concluded that for a successful carb rebuild you need to take a lot of photos during teardown and have a really good memory on how to put it back together right.
Bye the bye, I was doing some last minute inpections before tomorrow's run and discovered the reason I haven't been able to idle at full choke. The little doohicky (tech term) that captures the linkage for the choke breaker onto the swivel is missing. It appears that this missing part might either be a tiny e-clip or wire link. I shrugged my shoulders and knew that I can start, run and get down the road and off road without it, but does anyone know off hand if it is a clip or a wire retainer? I didn't go upstairs to get my glasses to get a closer look to see if there was a hole through the linkage for a wire retainer or just a groove for an e-clip.