I bet he wants to use a firewall mounted rack since they are center steer and you can make the tie-rod end to the length easier than using a normal front steer rack. I am looking to do the same thing.
If that is what you are looking to do, you can just use an ol front steer rack and remove tie-rods, connect both the right and left shafts that come out of rack to each other with a tube or even flat stock. Then just drill into the flat stock for the lengths you want your tie-rods to be.
Sounds Ghetto, but FLAMING RIVER uses this design in their early T-bird Rack conversion. Here's the link:
http://www.flamingriver.com/cartimages/prd_lg_361.jpg