You can find all of the parts, eaton, manifold, brackets, intake, injectors, etc. for probably about 2K. You'll have to do some fab work to get some of the parts to fit, but, for the most part, it's a "fairly" smooth swap.
You can expect 400-440 RWHP, 400 TQ on a stock pulley.
If you check CMC, a member named Drenath has an eaton swapped Mach and it's one hell of a quick car. Not sure if Pete is a member here.
There's a considerable amount of work involved and there's TONs of smaller parts and things needed for the swap. You can check on mach1registry for tons of info on it. May be able to find someone selling a whole kit or most of it. Not sure if getting the parts is more difficult now a days or not.
For the work involved it's kinda hard to not just go the Procharger P1SC or Vortech route for a little more money but far less work. Obviously that's a different powerband but still more than enough to grenade the stock motor.