Check your local armature/alternator shops. You can price out a higher output alternator. The case size is a restrictor but you should be able to get plenty of amps-out alternator to work within those confinements. To add, they would have books and they usually know how to research them. For example, look for a stock application for the 5.2l engine. This provides a case number as well as the output. Then look for the same case # with a higher output for other applications. Pretty simple. And they will know there stuff, have dirty hands from working in the shop, etc. My experience has always been good with an armature shop, not only for an alternator, but the starter as well.
