Case 320-Conversion from 6-volt to 12-volt system

Currently have a Delco-Remy 6-volt generator with a 2-groove pulley. Will the pulley fit on a Delco, 10SI, 12-volt, 1-wire Alternator? What size Alternator is the best fit for a Case 320, 42amp or a 63 amp? I am hesitant to buying an alternator that " functions like a Delco" versus a Genuine Delco, fearing that the pulley won't fit. Any information and/or advise on what to buy and from what supplier would be greatly appreciated.
 
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