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As you increase the alternators amperage, the wiring system and respective connections need upgrading. The primary weakness is the 12 guage wire, tab terminals (bulkhead) and the amp guage. If you are planning to raise the system's current pull by adding fans, fuel pump, amplifiers, lights..
I would suggest that the entire wire harness and charging system be upgraded as well..
Just my $0.02.. 
Good advice! The weakest link theory is so true when it comes to dealing with this stuff.
Also, I left the stock charging system in place on my '68, including the points type regulator, and just added a dual field alternator with a solid state regulator, the larger wire directly to the starter relay terminal. It only had the stock electrical loads to support in the car though.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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