The black top notch type are harder to come by because they come from S14-15. They have variable timing and t28 turbo. It wasn't worth it in my case because the first thing i did when I bought the red top was yank out the t25, sold it and bought a top mount manifold with a gt32.

As for how much, you have to talk to him so he can break it down to you in prices, options and time span.