with nitro and alcohol/methanol fuel, you better believe you need tht hotter spark. two fuels tht don't like to burn very easy, especially at the concentrations you are gonna want them for maximum power. motor longevity is a mute point though, the engine is gonna be junk after one good pull. not tht it would be hard to rebuild for another run in an hour or two.After a bit of research it seems that the mixture would be 20-60% nitromethane, the rest methanol or alcohol. With a slightly oilier mix, around 15 to 1, rather than 20 to 1.
Like Jimmy Bloodmaker stated, you'd do best with bigger jets and a hotter ignition.