Ok, so all my stuff is set to arrive today, and I ordered some other stuff from Eurotubes in the meantime too. I have to go out of town tomorrow, for my company's annual meeting, so I won't get to start the Champ surgery until sometime next week. I have some choices to make, mainly these:

1. Keep original Stock Fender speaker or install the Weber Signature 8 Alnico.
2. Use the Weber Copper Cap rectifier or the NOS RCA 5Y3.
3. Use the vintage spec 20/20/20/20 cap can from Weber, or the one I just ordered from Eurotubes, a JJ 40/20/20/20 (as suggested by tunghaigichan)
4. Replace the RCA speaker output with a standard 1/4" switchcraft jack, or leave it stock.
5. Try to locate a 2.2k ohm 5 watt resistor for the cap can mod to reduce plate voltage and 60hz hum.

And then of course I will be replacing the other electrolytic caps in the amp, and installing new JJ 6v6 and ECC83S (12AX7) tubes.