What amp. rating to get for alternator?

WHATEVER you get, even a "stocker," PLEASE read this article about the problems of the bulkhead connector and ammeter circuit in these cars

http://www.madelectrical.com/electricaltech/amp-gauges.shtml

The bulkhead connector never was really adequate for anything over about 40A and not long ago we had a discussion about police/ taxi/ fleet vehicles, which had the bulkhead connector bypassed, evidently by the dealers

See this thread

http://www.forabodiesonly.com/mopar/showthread.php?t=184696