He's in Idaho, but you should call Joe Sokol. He's currently finishing up an LS4, but has done a few 4.9's and a 3.4 DOHC that have all come out top notch. He's in Coeur d'Alene, ID, right across the border from us here in Spokane.
If you're going to make it down to the Fiero Fest in Richland (weekend of Aug 14th) you can see his handy work and talk to him..
His username on the forum is Fieroking. I know he's booked for a few swaps here, but maybe he can squeeze ya in..
I'll PM you his phone number.
Currently in the middle of my 88 + 3800NA swap