problem with my position of my altenator.

Here's a dual groove pulley, but don't know what size your current is:

http://www.summitracing.com/parts/MCH-10049/

Here's a very small single groove (bring a battery charger):

http://www.summitracing.com/parts/MOR-64700/

I don't know if anyone makes a "low mount" kit for the stock alternator, but you might see if you can find one.