Not messed with a lot of turbos, but my experience with adapting diesel turbos to gas engines has not been good. The AR ratio and sizing of the turbo for the displacement of your engine is critical to make it work right. If I was to do a turbo, I would be to purchase an engineered kit, yes it is expensive, but so is blowing up engines. This article in Hot Rods gives you some idea of the issues with the cheap Chinese kits. Of course they are for a Chevy, but the idea is the same.
http://www.hotrod.com/articles/can-buy-small-block-turbo-kit-699-work/