I know I'm late reading this but if I'm not mistaken you should use DOT 4 I'm sure DOT 3 would work in a pinch but as long you are rebuilding the clutch system I would recommend using the correct Fluid.
I don't think it really matters. DOT4 has a higher boiling point but not a problem in a clutch system especially & unless it is synthetic DOT4 also absorbs moisture faster than DOT3, lowering it's boiling point at a higher rate. Most fluid you find now is both DOT 3&4 compatible.
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