Which style alternator do I need?

No, I don't. The thing is, in "original speak," and this is no longer true what with aftermarket, AKA "Powermaster, etc," and the quanity, not quality, "parts store rebuilds," but some LOWER max output Mopar units, (46A?) actually put out more at lower RPM than some higher maximum rated units.

If you have not, read this:

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

which gives some insight into bulkhead connector problems.

Also you don't always NEED a huge 100a unit, unless you've added a bunch of "stuff," electric fans, etc.