I am looking at purchasing this alternator for my car when I convert it to serpentine set up. My question is, is this style a direct swap into the car without having to modify anything? Thanks.
http://www.summitracing.com/parts/pw...ro?prefilter=1

If your 85 has a GM SI type Alt at present you will need a adapter harness for a CS-130 / 144 conversion

http://www.novaresource.org/alternator.htm
http://temp.corvetteforum.net/c3/zma...ternator01.htm

There will be a new wiring harness going in the car along with the serpentine set up swap. So other than that, I'm fine?

Yes. That alt will work for your serp conversion.