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Measure the length of the axle - if it’s 120mm * or so then you can fit external cups with a 30mm ID bearing, providing the axle has a non tapered surface to accept the bearing.
* can’t remember the exact length of the ‘long’ 30mm axle but the short and true bb30 axles were 100mm or so before the arms are bolted on.
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Roughly as @Howard intimates, some "BB30" crank sets are really BB386 with padding to take up the space when used with a true BB30 shell. 30mm cups in a 68mm wide BSC threaded shell will have a width over the outside of the bearing races of 86mm, so you need that much between the inside faces of the crank bosses on your assembled crank set.
Howard
gbj_tester
@hp93
Is there a way to go from BSA threads to BB30 cranks?