12 SI Alternator, 78 or 100 Amp?

I am updating the wiring on my 1971 Demon 440-727 combo. The car will be mainly street ;) since the closest track is over 3 hours away. Using a American Autowire Highway 22 kit, AAH trunk long wire kit, trunk mount battery, 4-pole battery disconnect, Autometer gauges, headlight relays, and electric fuel pump. My 440 is mounted with a MRE motor plate so the alternator will be some custom low mount position. I want to use a Denso SI 12 alternator with either 78 amps or the 100 amp version. I know the 100 amp will run a little hotter. I may add electric fans later. I just don't like doing things twice when I coulda-shoulda-woulda. Any information would be greatly appreciated.
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