Took the carb back off. There's not much in the way of disassembly beyond what I had already done. Top comes off - that's about it. I blew every orifice out with 120 PSI and it's currently soaking in carb cleaner. I'll blow it out again after I rinse it off.
I had to destroy the manifold gasket removing it, so I need to wait for that to come in.
As far as maintenance goes, I'm pretty sure the previous owner didn't use the generator much, but he did maintain everything by the book (I have stacks of manuals and records for the thing). The hour meter only showed about 150 hours when I got it. I put another 50 hours on it. I changed the oil, filter and fuel filter when I first got it just in case. Most maintenance items are in 100 hour intervals.
Since it sat so long, I think there's a lot of crud in the gas tank. The fuel filter should catch it, so I can't explain the giant hunk of crud I fished out of the fuel inlet today.
Hopefully a thorough carb cleaning, points and condenser will get it back to normal. I hate to say it but the RV's value to me is diminished significantly if it has no generator.