All of the "e" series 320's had/have hollow cranks but some don't have the transfer tube in the hollow or the main nose bearing set up for constant speed. So some "e" series 320's are for fixed pitch only, even though they have hollow cranks and some are set up for fixed pitch but are constant speed capable.
The e models in the parts book that show 8 main bearings are the ones that are for fixed pitch only. The ones that show 4 main bearings and 2 nose bearings are the ones that could go constant speed from a crank and bearing perspective.
Good Luck,
Mahlon
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