Output is in the neighborhood of 40W.
For cost effectivity, I would recommend JJ E34Ls - or maybe the new KT77, if you can get them - and also their GZ34.
For caps, you can get an exact replacement from Antique Electronics. I prefer NOT to use a 4-section, myself. For the first bank, I use two 60uF/350V Sprague Atoms in series, each bypassed by a 220K/1W resistor. I use a Sprague Atom 20uF/600V for the second bank, then I replace the can with a dual 32uF/500V LCR-style can - I use F&T or JJ, depending upon what I have.