what kind/brand of alternator do you need, most of them are pretty generic,
check with your local auto electric or auto parts and match something up off the shelf
, the pulleys can be swapped to spin the alternator at the correct speed.
my guess would be that it is either a prestolite, delco or leece/neeville alt. if you go with a self regulating alternator you only need a + wire to the charging system and a good ground thru the case.