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Educate yourself by reading this. Then purchase and install a Denso alternator. All problems solved.
From my experiences, the square back and the round back alternators have the same low idle problems. Not enough output to keep the lights bright. 
Take a look at AndyF's Denso setup.
Some good advice, but if he doesn't have any aftermarket electrical load a squarback will be more than enough to stop the low idle issues.
Denso's will work, but aren't much better compared to what's available these days. How about a CS144 with 80 to 115 amps at idle and 140+ just above idle. Bolts on to the stock mount with a $30 adaptor.
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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