I like to use a 12SI alternator rather than the 10SI found on earlier vehicles. It has a better regulator, more holes in the case for cooling, better charging at low speed and an improved fan. And it's usually not too expensive. There's a 94A version that works well. Applications include some cop cars, later Jeep CJ's, and the 85 Olds Calais.
http://www.rockauto.com/catalog/more...209&cc=1217067