Mapp torch is brill, the type plumbers use with the trigger igniter is handy for general shop use.

Heat treatment oven for springs and tools.

Heat gun is pretty handy for all sorts, heat bluing small parts when needed as the color change is slower and less aggressive and you can watch it carefully, good for warming finishing oils and heating stocks to burn out the oil that they have soaked up.

Have a big propane tank with a bigger nozzle for doing rib work and such.