I can pop the top of mine if you want to know what is installed- Nate, you can do the same.
Personally, I'd go with the 220uF and bypass it with a small film or leave it at 47uF, there's plenty of room and caps are a lot smaller than the were in 1983. The zener reg supply runs both channels diff front ends. Perhaps they specified 220uF, but there was too much zener noise in the front end, so they went with a smaller value with less inductance at HF.
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The 3.9K 2W resistor would have survived a shorted cap to ground, it would have dissipated around 1.1W in that situation, so it shouldn't be cooked.