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If I were to do a large quantity of small parts, I think I would make an electrolytic rust remover. Tech Tips -- Electrolytic Rust Removal
You can connect as many parts as will fit in your tub together with a wire and clean them all at once.
A big high-torque gas engine is a good choice. But any big GM would work equally well. I would guess that finding a running example is getting harder every day since they haven't been made in nearly 40 years.