Look up Morad, I always hear good things from them.
That's going to be your best bet with out a doubt. Your better off just calling him. Tell him your from the fourms and you'll most likely get a pretty decent deal on what you need. I've had great luck dealing with Ed. He's great to deal with for anything w-body related.

You won't find to many motor's on the fourms, and if you do not very often are you going to find somthing trun key ready, if that's what your looking for.