I though I would leave this one to the more experienced restorers, but since no one likes to be ignored here is my two-cents worth.
As far as larger sized wiring goes, it can never hurt to use thicker wire (the AWG-- American Wire Gauge-- number gets SMALLER).
e.g.
#14 copper- 15 amps
#12 copper- 20 amps
#10 copper- 30 amps
These have an interesting history- the more "pulls" required through progressively smallers opening to get the deisired final size is why the gauge number goes UP (where intuitively it wouuld go dowm) for thinner wires..
Of course the concern here is more to have wire that is suited and rated for high-temperature applications- again I am not sure but look for wire of the right rating.
Someone tell us what is available-- , I think I have seen wire that goes up to 60* C, but there has to be "better" than that.
And of course, I think stranded wire here is what is called for in that solid core wire is not usualy used when flexibility is desired.
And there it is, Toggle bowing out now. But I'd also like to hear from someone who knows definitively and can knock-out these variables. Tks.