If U are going to up the alternator capability, suggest U go through the entire electrical system...
The Mopar 68 OE system uses connectors, terminals that can only handle 25-35 AMPS @ max. One of the 1st areas needing upgrading are the bulkhead connectors, also revise the AMP guage to one for Voltage..

Think through the entire electrical system, are U going to be adding other higher current draw accessories such as electronics, subwoofer amplifier, electric fans.

Just my $0.05...