Looks like it's in Sams 759-7, so not likely to find a free schematic. http://www.oocities.org/russlk/samradio.txt is selling a Sams for your model for $10 - just in case you're willing to pay for it.
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Rado Attic's Archives has this set (Arvin 35R58).
http://www.radioatticarchives.com/radio.htm?radio=9469
It has a different tube complement from the one that you described- i.e.: 18FX6, 18FW6, 12DT8, 18GD6, 20EZ7 (x2), 50HK6, and 50C5. Might your set have acquired some incorrect tubes somewhere along the line? That could account for the overheating, especially if an 18 or 20 volt tube was substituted for the 50C5.
It would be interesting to see how the series heaters are wired in this set- I am guessing that there are two separate strings, since the tube voltage values add up to 224 volts.