I am an AUDIOPHILE (BASShead) and I found this little company that makes a bolt on bracket to fit a large case (AD244) alternator in place of our little stock ones. They put outmore amps from the get go, and they are more common. I found an Iraggi 300a for $300 shipped. I just ordered one and will keep ya'll posted!
Tell them Chris sent ya!
Chevy 3100, 3400, 3500, 3800 and 3900 Alternator Upgrade